sys/netinet/sctp_input.c

   1 /*-
   2  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  * a) Redistributions of source code must retain the above copyright notice,
  10  *    this list of conditions and the following disclaimer.
  11  *
  12  * b) Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *    the documentation and/or other materials provided with the distribution.
  15  *
  16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  17  *    contributors may be used to endorse or promote products derived
  18  *    from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  30  * THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <netinet/sctp_os.h>
  37 #include <netinet/sctp_var.h>
  38 #include <netinet/sctp_sysctl.h>
  39 #include <netinet/sctp_pcb.h>
  40 #include <netinet/sctp_header.h>
  41 #include <netinet/sctputil.h>
  42 #include <netinet/sctp_output.h>
  43 #include <netinet/sctp_input.h>
  44 #include <netinet/sctp_auth.h>
  45 #include <netinet/sctp_indata.h>
  46 #include <netinet/sctp_asconf.h>
  47 #include <netinet/sctp_bsd_addr.h>
  48 #include <netinet/sctp_timer.h>
  49 #include <netinet/sctp_crc32.h>
  50 #if defined(INET) || defined(INET6)
  51 #include <netinet/udp.h>
  52 #endif
  53 #include <sys/smp.h>
  54
  55
  56
  57 static void
  58 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb)
  59 {
  60         struct sctp_nets *net;
  61
  62         /*
  63          * This now not only stops all cookie timers it also stops any INIT
  64          * timers as well. This will make sure that the timers are stopped
  65          * in all collision cases.
  66          */
  67         SCTP_TCB_LOCK_ASSERT(stcb);
  68         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
  69                 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) {
  70                         sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE,
  71                             stcb->sctp_ep,
  72                             stcb,
  73                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1);
  74                 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) {
  75                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT,
  76                             stcb->sctp_ep,
  77                             stcb,
  78                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2);
  79                 }
  80         }
  81 }
  82
  83 /* INIT handler */
  84 static void
  85 sctp_handle_init(struct mbuf *m, int iphlen, int offset,
  86     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
  87     struct sctp_init_chunk *cp, struct sctp_inpcb *inp,
  88     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_no_unlock,
  89     uint8_t mflowtype, uint32_t mflowid,
  90     uint32_t vrf_id, uint16_t port)
  91 {
  92         struct sctp_init *init;
  93         struct mbuf *op_err;
  94
  95         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n",
  96             (void *)stcb);
  97         if (stcb == NULL) {
  98                 SCTP_INP_RLOCK(inp);
  99         }
 100         /* validate length */
 101         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) {
 102                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 103                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 104                     mflowtype, mflowid,
 105                     vrf_id, port);
 106                 if (stcb)
 107                         *abort_no_unlock = 1;
 108                 goto outnow;
 109         }
 110         /* validate parameters */
 111         init = &cp->init;
 112         if (init->initiate_tag == 0) {
 113                 /* protocol error... send abort */
 114                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 115                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 116                     mflowtype, mflowid,
 117                     vrf_id, port);
 118                 if (stcb)
 119                         *abort_no_unlock = 1;
 120                 goto outnow;
 121         }
 122         if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) {
 123                 /* invalid parameter... send abort */
 124                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 125                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 126                     mflowtype, mflowid,
 127                     vrf_id, port);
 128                 if (stcb)
 129                         *abort_no_unlock = 1;
 130                 goto outnow;
 131         }
 132         if (init->num_inbound_streams == 0) {
 133                 /* protocol error... send abort */
 134                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 135                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 136                     mflowtype, mflowid,
 137                     vrf_id, port);
 138                 if (stcb)
 139                         *abort_no_unlock = 1;
 140                 goto outnow;
 141         }
 142         if (init->num_outbound_streams == 0) {
 143                 /* protocol error... send abort */
 144                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 145                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 146                     mflowtype, mflowid,
 147                     vrf_id, port);
 148                 if (stcb)
 149                         *abort_no_unlock = 1;
 150                 goto outnow;
 151         }
 152         if (sctp_validate_init_auth_params(m, offset + sizeof(*cp),
 153             offset + ntohs(cp->ch.chunk_length))) {
 154                 /* auth parameter(s) error... send abort */
 155                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 156                     "Problem with AUTH parameters");
 157                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 158                     mflowtype, mflowid,
 159                     vrf_id, port);
 160                 if (stcb)
 161                         *abort_no_unlock = 1;
 162                 goto outnow;
 163         }
 164         /*
 165          * We are only accepting if we have a socket with positive
 166          * so_qlimit.
 167          */
 168         if ((stcb == NULL) &&
 169             ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
 170             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
 171             (inp->sctp_socket == NULL) ||
 172             (inp->sctp_socket->so_qlimit == 0))) {
 173                 /*
 174                  * FIX ME ?? What about TCP model and we have a
 175                  * match/restart case? Actually no fix is needed. the lookup
 176                  * will always find the existing assoc so stcb would not be
 177                  * NULL. It may be questionable to do this since we COULD
 178                  * just send back the INIT-ACK and hope that the app did
 179                  * accept()'s by the time the COOKIE was sent. But there is
 180                  * a price to pay for COOKIE generation and I don't want to
 181                  * pay it on the chance that the app will actually do some
 182                  * accepts(). The App just looses and should NOT be in this
 183                  * state :-)
 184                  */
 185                 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) {
 186                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 187                             "No listener");
 188                         sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
 189                             mflowtype, mflowid, inp->fibnum,
 190                             vrf_id, port);
 191                 }
 192                 goto outnow;
 193         }
 194         if ((stcb != NULL) &&
 195             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 196                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n");
 197                 sctp_send_shutdown_ack(stcb, NULL);
 198                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
 199         } else {
 200                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n");
 201                 sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset,
 202                     src, dst, sh, cp,
 203                     mflowtype, mflowid,
 204                     vrf_id, port,
 205                     ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED));
 206         }
 207 outnow:
 208         if (stcb == NULL) {
 209                 SCTP_INP_RUNLOCK(inp);
 210         }
 211 }
 212
 213 /*
 214  * process peer "INIT/INIT-ACK" chunk returns value < 0 on error
 215  */
 216
 217 int
 218 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked
 219 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 220     SCTP_UNUSED
 221 #endif
 222 )
 223 {
 224         int unsent_data = 0;
 225         unsigned int i;
 226         struct sctp_stream_queue_pending *sp;
 227         struct sctp_association *asoc;
 228
 229         /*
 230          * This function returns the number of streams that have true unsent
 231          * data on them. Note that as it looks through it will clean up any
 232          * places that have old data that has been sent but left at top of
 233          * stream queue.
 234          */
 235         asoc = &stcb->asoc;
 236         SCTP_TCB_SEND_LOCK(stcb);
 237         if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
 238                 /* Check to see if some data queued */
 239                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 240                         /* sa_ignore FREED_MEMORY */
 241                         sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue);
 242                         if (sp == NULL) {
 243                                 continue;
 244                         }
 245                         if ((sp->msg_is_complete) &&
 246                             (sp->length == 0) &&
 247                             (sp->sender_all_done)) {
 248                                 /*
 249                                  * We are doing differed cleanup. Last time
 250                                  * through when we took all the data the
 251                                  * sender_all_done was not set.
 252                                  */
 253                                 if (sp->put_last_out == 0) {
 254                                         SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
 255                                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
 256                                             sp->sender_all_done,
 257                                             sp->length,
 258                                             sp->msg_is_complete,
 259                                             sp->put_last_out);
 260                                 }
 261                                 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
 262                                 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next);
 263                                 if (sp->net) {
 264                                         sctp_free_remote_addr(sp->net);
 265                                         sp->net = NULL;
 266                                 }
 267                                 if (sp->data) {
 268                                         sctp_m_freem(sp->data);
 269                                         sp->data = NULL;
 270                                 }
 271                                 sctp_free_a_strmoq(stcb, sp, so_locked);
 272                         } else {
 273                                 unsent_data++;
 274                                 break;
 275                         }
 276                 }
 277         }
 278         SCTP_TCB_SEND_UNLOCK(stcb);
 279         return (unsent_data);
 280 }
 281
 282 static int
 283 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb)
 284 {
 285         struct sctp_init *init;
 286         struct sctp_association *asoc;
 287         struct sctp_nets *lnet;
 288         unsigned int i;
 289
 290         init = &cp->init;
 291         asoc = &stcb->asoc;
 292         /* save off parameters */
 293         asoc->peer_vtag = ntohl(init->initiate_tag);
 294         asoc->peers_rwnd = ntohl(init->a_rwnd);
 295         /* init tsn's */
 296         asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1;
 297
 298         if (!TAILQ_EMPTY(&asoc->nets)) {
 299                 /* update any ssthresh's that may have a default */
 300                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
 301                         lnet->ssthresh = asoc->peers_rwnd;
 302                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) {
 303                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION);
 304                         }
 305                 }
 306         }
 307         SCTP_TCB_SEND_LOCK(stcb);
 308         if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
 309                 unsigned int newcnt;
 310                 struct sctp_stream_out *outs;
 311                 struct sctp_stream_queue_pending *sp, *nsp;
 312                 struct sctp_tmit_chunk *chk, *nchk;
 313
 314                 /* abandon the upper streams */
 315                 newcnt = ntohs(init->num_inbound_streams);
 316                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
 317                         if (chk->rec.data.stream_number >= newcnt) {
 318                                 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
 319                                 asoc->send_queue_cnt--;
 320                                 if (asoc->strmout[chk->rec.data.stream_number].chunks_on_queues > 0) {
 321                                         asoc->strmout[chk->rec.data.stream_number].chunks_on_queues--;
 322 #ifdef INVARIANTS
 323                                 } else {
 324                                         panic("No chunks on the queues for sid %u.", chk->rec.data.stream_number);
 325 #endif
 326                                 }
 327                                 if (chk->data != NULL) {
 328                                         sctp_free_bufspace(stcb, asoc, chk, 1);
 329                                         sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb,
 330                                             0, chk, SCTP_SO_NOT_LOCKED);
 331                                         if (chk->data) {
 332                                                 sctp_m_freem(chk->data);
 333                                                 chk->data = NULL;
 334                                         }
 335                                 }
 336                                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 337                                 /* sa_ignore FREED_MEMORY */
 338                         }
 339                 }
 340                 if (asoc->strmout) {
 341                         for (i = newcnt; i < asoc->pre_open_streams; i++) {
 342                                 outs = &asoc->strmout[i];
 343                                 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) {
 344                                         TAILQ_REMOVE(&outs->outqueue, sp, next);
 345                                         asoc->stream_queue_cnt--;
 346                                         sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
 347                                             stcb, 0, sp, SCTP_SO_NOT_LOCKED);
 348                                         if (sp->data) {
 349                                                 sctp_m_freem(sp->data);
 350                                                 sp->data = NULL;
 351                                         }
 352                                         if (sp->net) {
 353                                                 sctp_free_remote_addr(sp->net);
 354                                                 sp->net = NULL;
 355                                         }
 356                                         /* Free the chunk */
 357                                         sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED);
 358                                         /* sa_ignore FREED_MEMORY */
 359                                 }
 360                                 outs->state = SCTP_STREAM_CLOSED;
 361                         }
 362                 }
 363                 /* cut back the count */
 364                 asoc->pre_open_streams = newcnt;
 365         }
 366         SCTP_TCB_SEND_UNLOCK(stcb);
 367         asoc->streamoutcnt = asoc->pre_open_streams;
 368         if (asoc->strmout) {
 369                 for (i = 0; i < asoc->streamoutcnt; i++) {
 370                         asoc->strmout[i].state = SCTP_STREAM_OPEN;
 371                 }
 372         }
 373         /* EY - nr_sack: initialize highest tsn in nr_mapping_array */
 374         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
 375         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
 376                 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
 377         }
 378         /* This is the next one we expect */
 379         asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
 380
 381         asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
 382         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
 383
 384         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
 385         /* open the requested streams */
 386
 387         if (asoc->strmin != NULL) {
 388                 /* Free the old ones */
 389                 for (i = 0; i < asoc->streamincnt; i++) {
 390                         sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue);
 391                         sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue);
 392                 }
 393                 SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
 394         }
 395         if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) {
 396                 asoc->streamincnt = ntohs(init->num_outbound_streams);
 397         } else {
 398                 asoc->streamincnt = asoc->max_inbound_streams;
 399         }
 400         SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
 401             sizeof(struct sctp_stream_in), SCTP_M_STRMI);
 402         if (asoc->strmin == NULL) {
 403                 /* we didn't get memory for the streams! */
 404                 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
 405                 return (-1);
 406         }
 407         for (i = 0; i < asoc->streamincnt; i++) {
 408                 asoc->strmin[i].stream_no = i;
 409                 asoc->strmin[i].last_sequence_delivered = 0xffffffff;
 410                 TAILQ_INIT(&asoc->strmin[i].inqueue);
 411                 TAILQ_INIT(&asoc->strmin[i].uno_inqueue);
 412                 asoc->strmin[i].pd_api_started = 0;
 413                 asoc->strmin[i].delivery_started = 0;
 414         }
 415         /*
 416          * load_address_from_init will put the addresses into the
 417          * association when the COOKIE is processed or the INIT-ACK is
 418          * processed. Both types of COOKIE's existing and new call this
 419          * routine. It will remove addresses that are no longer in the
 420          * association (for the restarting case where addresses are
 421          * removed). Up front when the INIT arrives we will discard it if it
 422          * is a restart and new addresses have been added.
 423          */
 424         /* sa_ignore MEMLEAK */
 425         return (0);
 426 }
 427
 428 /*
 429  * INIT-ACK message processing/consumption returns value < 0 on error
 430  */
 431 static int
 432 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
 433     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
 434     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
 435     struct sctp_nets *net, int *abort_no_unlock,
 436     uint8_t mflowtype, uint32_t mflowid,
 437     uint32_t vrf_id)
 438 {
 439         struct sctp_association *asoc;
 440         struct mbuf *op_err;
 441         int retval, abort_flag;
 442         uint32_t initack_limit;
 443         int nat_friendly = 0;
 444
 445         /* First verify that we have no illegal param's */
 446         abort_flag = 0;
 447
 448         op_err = sctp_arethere_unrecognized_parameters(m,
 449             (offset + sizeof(struct sctp_init_chunk)),
 450             &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly);
 451         if (abort_flag) {
 452                 /* Send an abort and notify peer */
 453                 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
 454                 *abort_no_unlock = 1;
 455                 return (-1);
 456         }
 457         asoc = &stcb->asoc;
 458         asoc->peer_supports_nat = (uint8_t) nat_friendly;
 459         /* process the peer's parameters in the INIT-ACK */
 460         retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb);
 461         if (retval < 0) {
 462                 return (retval);
 463         }
 464         initack_limit = offset + ntohs(cp->ch.chunk_length);
 465         /* load all addresses */
 466         if ((retval = sctp_load_addresses_from_init(stcb, m,
 467             (offset + sizeof(struct sctp_init_chunk)), initack_limit,
 468             src, dst, NULL, stcb->asoc.port))) {
 469                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 470                     "Problem with address parameters");
 471                 SCTPDBG(SCTP_DEBUG_INPUT1,
 472                     "Load addresses from INIT causes an abort %d\n",
 473                     retval);
 474                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 475                     src, dst, sh, op_err,
 476                     mflowtype, mflowid,
 477                     vrf_id, net->port);
 478                 *abort_no_unlock = 1;
 479                 return (-1);
 480         }
 481         /* if the peer doesn't support asconf, flush the asconf queue */
 482         if (asoc->asconf_supported == 0) {
 483                 struct sctp_asconf_addr *param, *nparam;
 484
 485                 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) {
 486                         TAILQ_REMOVE(&asoc->asconf_queue, param, next);
 487                         SCTP_FREE(param, SCTP_M_ASC_ADDR);
 488                 }
 489         }
 490         stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
 491             stcb->asoc.local_hmacs);
 492         if (op_err) {
 493                 sctp_queue_op_err(stcb, op_err);
 494                 /* queuing will steal away the mbuf chain to the out queue */
 495                 op_err = NULL;
 496         }
 497         /* extract the cookie and queue it to "echo" it back... */
 498         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 499                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 500                     stcb->asoc.overall_error_count,
 501                     0,
 502                     SCTP_FROM_SCTP_INPUT,
 503                     __LINE__);
 504         }
 505         stcb->asoc.overall_error_count = 0;
 506         net->error_count = 0;
 507
 508         /*
 509          * Cancel the INIT timer, We do this first before queueing the
 510          * cookie. We always cancel at the primary to assue that we are
 511          * canceling the timer started by the INIT which always goes to the
 512          * primary.
 513          */
 514         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
 515             asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
 516
 517         /* calculate the RTO */
 518         net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy,
 519             SCTP_RTT_FROM_NON_DATA);
 520         retval = sctp_send_cookie_echo(m, offset, stcb, net);
 521         if (retval < 0) {
 522                 /*
 523                  * No cookie, we probably should send a op error. But in any
 524                  * case if there is no cookie in the INIT-ACK, we can
 525                  * abandon the peer, its broke.
 526                  */
 527                 if (retval == -3) {
 528                         uint16_t len;
 529
 530                         len = (uint16_t) (sizeof(struct sctp_error_missing_param) + sizeof(uint16_t));
 531                         /* We abort with an error of missing mandatory param */
 532                         op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA);
 533                         if (op_err != NULL) {
 534                                 struct sctp_error_missing_param *cause;
 535
 536                                 SCTP_BUF_LEN(op_err) = len;
 537                                 cause = mtod(op_err, struct sctp_error_missing_param *);
 538                                 /* Subtract the reserved param */
 539                                 cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM);
 540                                 cause->cause.length = htons(len);
 541                                 cause->num_missing_params = htonl(1);
 542                                 cause->type[0] = htons(SCTP_STATE_COOKIE);
 543                         }
 544                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 545                             src, dst, sh, op_err,
 546                             mflowtype, mflowid,
 547                             vrf_id, net->port);
 548                         *abort_no_unlock = 1;
 549                 }
 550                 return (retval);
 551         }
 552         return (0);
 553 }
 554
 555 static void
 556 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
 557     struct sctp_tcb *stcb, struct sctp_nets *net)
 558 {
 559         union sctp_sockstore store;
 560         struct sctp_nets *r_net, *f_net;
 561         struct timeval tv;
 562         int req_prim = 0;
 563         uint16_t old_error_counter;
 564
 565         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
 566                 /* Invalid length */
 567                 return;
 568         }
 569         memset(&store, 0, sizeof(store));
 570         switch (cp->heartbeat.hb_info.addr_family) {
 571 #ifdef INET
 572         case AF_INET:
 573                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
 574                         store.sin.sin_family = cp->heartbeat.hb_info.addr_family;
 575                         store.sin.sin_len = cp->heartbeat.hb_info.addr_len;
 576                         store.sin.sin_port = stcb->rport;
 577                         memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address,
 578                             sizeof(store.sin.sin_addr));
 579                 } else {
 580                         return;
 581                 }
 582                 break;
 583 #endif
 584 #ifdef INET6
 585         case AF_INET6:
 586                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
 587                         store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family;
 588                         store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len;
 589                         store.sin6.sin6_port = stcb->rport;
 590                         memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr));
 591                 } else {
 592                         return;
 593                 }
 594                 break;
 595 #endif
 596         default:
 597                 return;
 598         }
 599         r_net = sctp_findnet(stcb, &store.sa);
 600         if (r_net == NULL) {
 601                 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
 602                 return;
 603         }
 604         if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
 605             (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
 606             (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
 607                 /*
 608                  * If the its a HB and it's random value is correct when can
 609                  * confirm the destination.
 610                  */
 611                 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 612                 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
 613                         stcb->asoc.primary_destination = r_net;
 614                         r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
 615                         f_net = TAILQ_FIRST(&stcb->asoc.nets);
 616                         if (f_net != r_net) {
 617                                 /*
 618                                  * first one on the list is NOT the primary
 619                                  * sctp_cmpaddr() is much more efficient if
 620                                  * the primary is the first on the list,
 621                                  * make it so.
 622                                  */
 623                                 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
 624                                 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
 625                         }
 626                         req_prim = 1;
 627                 }
 628                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 629                     stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 630                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb,
 631                     r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
 632                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 633         }
 634         old_error_counter = r_net->error_count;
 635         r_net->error_count = 0;
 636         r_net->hb_responded = 1;
 637         tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
 638         tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
 639         /* Now lets do a RTO with this */
 640         r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy,
 641             SCTP_RTT_FROM_NON_DATA);
 642         if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) {
 643                 r_net->dest_state |= SCTP_ADDR_REACHABLE;
 644                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
 645                     0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 646         }
 647         if (r_net->dest_state & SCTP_ADDR_PF) {
 648                 r_net->dest_state &= ~SCTP_ADDR_PF;
 649                 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
 650         }
 651         if (old_error_counter > 0) {
 652                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
 653                     stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5);
 654                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 655         }
 656         if (r_net == stcb->asoc.primary_destination) {
 657                 if (stcb->asoc.alternate) {
 658                         /* release the alternate, primary is good */
 659                         sctp_free_remote_addr(stcb->asoc.alternate);
 660                         stcb->asoc.alternate = NULL;
 661                 }
 662         }
 663         /* Mobility adaptation */
 664         if (req_prim) {
 665                 if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
 666                     SCTP_MOBILITY_BASE) ||
 667                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 668                     SCTP_MOBILITY_FASTHANDOFF)) &&
 669                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 670                     SCTP_MOBILITY_PRIM_DELETED)) {
 671
 672                         sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED,
 673                             stcb->sctp_ep, stcb, NULL,
 674                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 675                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 676                             SCTP_MOBILITY_FASTHANDOFF)) {
 677                                 sctp_assoc_immediate_retrans(stcb,
 678                                     stcb->asoc.primary_destination);
 679                         }
 680                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 681                             SCTP_MOBILITY_BASE)) {
 682                                 sctp_move_chunks_from_net(stcb,
 683                                     stcb->asoc.deleted_primary);
 684                         }
 685                         sctp_delete_prim_timer(stcb->sctp_ep, stcb,
 686                             stcb->asoc.deleted_primary);
 687                 }
 688         }
 689 }
 690
 691 static int
 692 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
 693 {
 694         /*
 695          * return 0 means we want you to proceed with the abort non-zero
 696          * means no abort processing
 697          */
 698         struct sctpasochead *head;
 699
 700         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) {
 701                 /* generate a new vtag and send init */
 702                 LIST_REMOVE(stcb, sctp_asocs);
 703                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 704                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 705                 /*
 706                  * put it in the bucket in the vtag hash of assoc's for the
 707                  * system
 708                  */
 709                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 710                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 711                 return (1);
 712         }
 713         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
 714                 /*
 715                  * treat like a case where the cookie expired i.e.: - dump
 716                  * current cookie. - generate a new vtag. - resend init.
 717                  */
 718                 /* generate a new vtag and send init */
 719                 LIST_REMOVE(stcb, sctp_asocs);
 720                 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED;
 721                 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT;
 722                 sctp_stop_all_cookie_timers(stcb);
 723                 sctp_toss_old_cookies(stcb, &stcb->asoc);
 724                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 725                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 726                 /*
 727                  * put it in the bucket in the vtag hash of assoc's for the
 728                  * system
 729                  */
 730                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 731                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 732                 return (1);
 733         }
 734         return (0);
 735 }
 736
 737 static int
 738 sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
 739     struct sctp_nets *net)
 740 {
 741         /*
 742          * return 0 means we want you to proceed with the abort non-zero
 743          * means no abort processing
 744          */
 745         if (stcb->asoc.auth_supported == 0) {
 746                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
 747                 return (0);
 748         }
 749         sctp_asconf_send_nat_state_update(stcb, net);
 750         return (1);
 751 }
 752
 753
 754 static void
 755 sctp_handle_abort(struct sctp_abort_chunk *abort,
 756     struct sctp_tcb *stcb, struct sctp_nets *net)
 757 {
 758 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 759         struct socket *so;
 760
 761 #endif
 762         uint16_t len;
 763         uint16_t error;
 764
 765         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
 766         if (stcb == NULL)
 767                 return;
 768
 769         len = ntohs(abort->ch.chunk_length);
 770         if (len > sizeof(struct sctp_chunkhdr)) {
 771                 /*
 772                  * Need to check the cause codes for our two magic nat
 773                  * aborts which don't kill the assoc necessarily.
 774                  */
 775                 struct sctp_gen_error_cause *cause;
 776
 777                 cause = (struct sctp_gen_error_cause *)(abort + 1);
 778                 error = ntohs(cause->code);
 779                 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) {
 780                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
 781                             abort->ch.chunk_flags);
 782                         if (sctp_handle_nat_colliding_state(stcb)) {
 783                                 return;
 784                         }
 785                 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) {
 786                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
 787                             abort->ch.chunk_flags);
 788                         if (sctp_handle_nat_missing_state(stcb, net)) {
 789                                 return;
 790                         }
 791                 }
 792         } else {
 793                 error = 0;
 794         }
 795         /* stop any receive timers */
 796         sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net,
 797             SCTP_FROM_SCTP_INPUT + SCTP_LOC_7);
 798         /* notify user of the abort and clean up... */
 799         sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED);
 800         /* free the tcb */
 801         SCTP_STAT_INCR_COUNTER32(sctps_aborted);
 802         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) ||
 803             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 804                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 805         }
 806 #ifdef SCTP_ASOCLOG_OF_TSNS
 807         sctp_print_out_track_log(stcb);
 808 #endif
 809 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 810         so = SCTP_INP_SO(stcb->sctp_ep);
 811         atomic_add_int(&stcb->asoc.refcnt, 1);
 812         SCTP_TCB_UNLOCK(stcb);
 813         SCTP_SOCKET_LOCK(so, 1);
 814         SCTP_TCB_LOCK(stcb);
 815         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 816 #endif
 817         stcb->asoc.state |= SCTP_STATE_WAS_ABORTED;
 818         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 819             SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
 820 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 821         SCTP_SOCKET_UNLOCK(so, 1);
 822 #endif
 823         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
 824 }
 825
 826 static void
 827 sctp_start_net_timers(struct sctp_tcb *stcb)
 828 {
 829         uint32_t cnt_hb_sent;
 830         struct sctp_nets *net;
 831
 832         cnt_hb_sent = 0;
 833         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 834                 /*
 835                  * For each network start: 1) A pmtu timer. 2) A HB timer 3)
 836                  * If the dest in unconfirmed send a hb as well if under
 837                  * max_hb_burst have been sent.
 838                  */
 839                 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
 840                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
 841                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
 842                     (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) {
 843                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 844                         cnt_hb_sent++;
 845                 }
 846         }
 847         if (cnt_hb_sent) {
 848                 sctp_chunk_output(stcb->sctp_ep, stcb,
 849                     SCTP_OUTPUT_FROM_COOKIE_ACK,
 850                     SCTP_SO_NOT_LOCKED);
 851         }
 852 }
 853
 854
 855 static void
 856 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
 857     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
 858 {
 859         struct sctp_association *asoc;
 860         int some_on_streamwheel;
 861         int old_state;
 862
 863 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 864         struct socket *so;
 865
 866 #endif
 867
 868         SCTPDBG(SCTP_DEBUG_INPUT2,
 869             "sctp_handle_shutdown: handling SHUTDOWN\n");
 870         if (stcb == NULL)
 871                 return;
 872         asoc = &stcb->asoc;
 873         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 874             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 875                 return;
 876         }
 877         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
 878                 /* Shutdown NOT the expected size */
 879                 return;
 880         }
 881         old_state = SCTP_GET_STATE(asoc);
 882         sctp_update_acked(stcb, cp, abort_flag);
 883         if (*abort_flag) {
 884                 return;
 885         }
 886         if (asoc->control_pdapi) {
 887                 /*
 888                  * With a normal shutdown we assume the end of last record.
 889                  */
 890                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 891                 if (asoc->control_pdapi->on_strm_q) {
 892                         struct sctp_stream_in *strm;
 893
 894                         strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream];
 895                         if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) {
 896                                 /* Unordered */
 897                                 TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm);
 898                                 asoc->control_pdapi->on_strm_q = 0;
 899                         } else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) {
 900                                 /* Ordered */
 901                                 TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm);
 902                                 asoc->control_pdapi->on_strm_q = 0;
 903 #ifdef INVARIANTS
 904                         } else {
 905                                 panic("Unknown state on ctrl:%p on_strm_q:%d",
 906                                     asoc->control_pdapi,
 907                                     asoc->control_pdapi->on_strm_q);
 908 #endif
 909                         }
 910                 }
 911                 asoc->control_pdapi->end_added = 1;
 912                 asoc->control_pdapi->pdapi_aborted = 1;
 913                 asoc->control_pdapi = NULL;
 914                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 915 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 916                 so = SCTP_INP_SO(stcb->sctp_ep);
 917                 atomic_add_int(&stcb->asoc.refcnt, 1);
 918                 SCTP_TCB_UNLOCK(stcb);
 919                 SCTP_SOCKET_LOCK(so, 1);
 920                 SCTP_TCB_LOCK(stcb);
 921                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 922                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 923                         /* assoc was freed while we were unlocked */
 924                         SCTP_SOCKET_UNLOCK(so, 1);
 925                         return;
 926                 }
 927 #endif
 928                 if (stcb->sctp_socket) {
 929                         sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 930                 }
 931 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 932                 SCTP_SOCKET_UNLOCK(so, 1);
 933 #endif
 934         }
 935         /* goto SHUTDOWN_RECEIVED state to block new requests */
 936         if (stcb->sctp_socket) {
 937                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 938                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
 939                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
 940                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED);
 941                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 942                         /*
 943                          * notify upper layer that peer has initiated a
 944                          * shutdown
 945                          */
 946                         sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 947
 948                         /* reset time */
 949                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
 950                 }
 951         }
 952         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
 953                 /*
 954                  * stop the shutdown timer, since we WILL move to
 955                  * SHUTDOWN-ACK-SENT.
 956                  */
 957                 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
 958                     net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
 959         }
 960         /* Now is there unsent data on a stream somewhere? */
 961         some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
 962
 963         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 964             !TAILQ_EMPTY(&asoc->sent_queue) ||
 965             some_on_streamwheel) {
 966                 /* By returning we will push more data out */
 967                 return;
 968         } else {
 969                 /* no outstanding data to send, so move on... */
 970                 /* send SHUTDOWN-ACK */
 971                 /* move to SHUTDOWN-ACK-SENT state */
 972                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
 973                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 974                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 975                 }
 976                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 977                 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
 978                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
 979                         sctp_stop_timers_for_shutdown(stcb);
 980                         sctp_send_shutdown_ack(stcb, net);
 981                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
 982                             stcb->sctp_ep, stcb, net);
 983                 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) {
 984                         sctp_send_shutdown_ack(stcb, net);
 985                 }
 986         }
 987 }
 988
 989 static void
 990 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED,
 991     struct sctp_tcb *stcb,
 992     struct sctp_nets *net)
 993 {
 994         struct sctp_association *asoc;
 995
 996 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 997         struct socket *so;
 998
 999         so = SCTP_INP_SO(stcb->sctp_ep);
1000 #endif
1001         SCTPDBG(SCTP_DEBUG_INPUT2,
1002             "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
1003         if (stcb == NULL)
1004                 return;
1005
1006         asoc = &stcb->asoc;
1007         /* process according to association state */
1008         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
1009             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
1010                 /* unexpected SHUTDOWN-ACK... do OOTB handling... */
1011                 sctp_send_shutdown_complete(stcb, net, 1);
1012                 SCTP_TCB_UNLOCK(stcb);
1013                 return;
1014         }
1015         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
1016             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
1017                 /* unexpected SHUTDOWN-ACK... so ignore... */
1018                 SCTP_TCB_UNLOCK(stcb);
1019                 return;
1020         }
1021         if (asoc->control_pdapi) {
1022                 /*
1023                  * With a normal shutdown we assume the end of last record.
1024                  */
1025                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
1026                 asoc->control_pdapi->end_added = 1;
1027                 asoc->control_pdapi->pdapi_aborted = 1;
1028                 asoc->control_pdapi = NULL;
1029                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
1030 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1031                 atomic_add_int(&stcb->asoc.refcnt, 1);
1032                 SCTP_TCB_UNLOCK(stcb);
1033                 SCTP_SOCKET_LOCK(so, 1);
1034                 SCTP_TCB_LOCK(stcb);
1035                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1036                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1037                         /* assoc was freed while we were unlocked */
1038                         SCTP_SOCKET_UNLOCK(so, 1);
1039                         return;
1040                 }
1041 #endif
1042                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
1043 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1044                 SCTP_SOCKET_UNLOCK(so, 1);
1045 #endif
1046         }
1047 #ifdef INVARIANTS
1048         if (!TAILQ_EMPTY(&asoc->send_queue) ||
1049             !TAILQ_EMPTY(&asoc->sent_queue) ||
1050             !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
1051                 panic("Queues are not empty when handling SHUTDOWN-ACK");
1052         }
1053 #endif
1054         /* stop the timer */
1055         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net,
1056             SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
1057         /* send SHUTDOWN-COMPLETE */
1058         sctp_send_shutdown_complete(stcb, net, 0);
1059         /* notify upper layer protocol */
1060         if (stcb->sctp_socket) {
1061                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1062                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
1063                         stcb->sctp_socket->so_snd.sb_cc = 0;
1064                 }
1065                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
1066         }
1067         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
1068         /* free the TCB but first save off the ep */
1069 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1070         atomic_add_int(&stcb->asoc.refcnt, 1);
1071         SCTP_TCB_UNLOCK(stcb);
1072         SCTP_SOCKET_LOCK(so, 1);
1073         SCTP_TCB_LOCK(stcb);
1074         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1075 #endif
1076         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1077             SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
1078 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1079         SCTP_SOCKET_UNLOCK(so, 1);
1080 #endif
1081 }
1082
1083 /*
1084  * Skip past the param header and then we will find the chunk that caused the
1085  * problem. There are two possibilities ASCONF or FWD-TSN other than that and
1086  * our peer must be broken.
1087  */
1088 static void
1089 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr,
1090     struct sctp_nets *net)
1091 {
1092         struct sctp_chunkhdr *chk;
1093
1094         chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr));
1095         switch (chk->chunk_type) {
1096         case SCTP_ASCONF_ACK:
1097         case SCTP_ASCONF:
1098                 sctp_asconf_cleanup(stcb, net);
1099                 break;
1100         case SCTP_IFORWARD_CUM_TSN:
1101         case SCTP_FORWARD_CUM_TSN:
1102                 stcb->asoc.prsctp_supported = 0;
1103                 break;
1104         default:
1105                 SCTPDBG(SCTP_DEBUG_INPUT2,
1106                     "Peer does not support chunk type %d(%x)??\n",
1107                     chk->chunk_type, (uint32_t) chk->chunk_type);
1108                 break;
1109         }
1110 }
1111
1112 /*
1113  * Skip past the param header and then we will find the param that caused the
1114  * problem.  There are a number of param's in a ASCONF OR the prsctp param
1115  * these will turn of specific features.
1116  * XXX: Is this the right thing to do?
1117  */
1118 static void
1119 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr)
1120 {
1121         struct sctp_paramhdr *pbad;
1122
1123         pbad = phdr + 1;
1124         switch (ntohs(pbad->param_type)) {
1125                 /* pr-sctp draft */
1126         case SCTP_PRSCTP_SUPPORTED:
1127                 stcb->asoc.prsctp_supported = 0;
1128                 break;
1129         case SCTP_SUPPORTED_CHUNK_EXT:
1130                 break;
1131                 /* draft-ietf-tsvwg-addip-sctp */
1132         case SCTP_HAS_NAT_SUPPORT:
1133                 stcb->asoc.peer_supports_nat = 0;
1134                 break;
1135         case SCTP_ADD_IP_ADDRESS:
1136         case SCTP_DEL_IP_ADDRESS:
1137         case SCTP_SET_PRIM_ADDR:
1138                 stcb->asoc.asconf_supported = 0;
1139                 break;
1140         case SCTP_SUCCESS_REPORT:
1141         case SCTP_ERROR_CAUSE_IND:
1142                 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
1143                 SCTPDBG(SCTP_DEBUG_INPUT2,
1144                     "Turning off ASCONF to this strange peer\n");
1145                 stcb->asoc.asconf_supported = 0;
1146                 break;
1147         default:
1148                 SCTPDBG(SCTP_DEBUG_INPUT2,
1149                     "Peer does not support param type %d(%x)??\n",
1150                     pbad->param_type, (uint32_t) pbad->param_type);
1151                 break;
1152         }
1153 }
1154
1155 static int
1156 sctp_handle_error(struct sctp_chunkhdr *ch,
1157     struct sctp_tcb *stcb, struct sctp_nets *net)
1158 {
1159         int chklen;
1160         struct sctp_paramhdr *phdr;
1161         uint16_t error, error_type;
1162         uint16_t error_len;
1163         struct sctp_association *asoc;
1164         int adjust;
1165
1166 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1167         struct socket *so;
1168
1169 #endif
1170
1171         /* parse through all of the errors and process */
1172         asoc = &stcb->asoc;
1173         phdr = (struct sctp_paramhdr *)((caddr_t)ch +
1174             sizeof(struct sctp_chunkhdr));
1175         chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr);
1176         error = 0;
1177         while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) {
1178                 /* Process an Error Cause */
1179                 error_type = ntohs(phdr->param_type);
1180                 error_len = ntohs(phdr->param_length);
1181                 if ((error_len > chklen) || (error_len == 0)) {
1182                         /* invalid param length for this param */
1183                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n",
1184                             chklen, error_len);
1185                         return (0);
1186                 }
1187                 if (error == 0) {
1188                         /* report the first error cause */
1189                         error = error_type;
1190                 }
1191                 switch (error_type) {
1192                 case SCTP_CAUSE_INVALID_STREAM:
1193                 case SCTP_CAUSE_MISSING_PARAM:
1194                 case SCTP_CAUSE_INVALID_PARAM:
1195                 case SCTP_CAUSE_NO_USER_DATA:
1196                         SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n",
1197                             error_type);
1198                         break;
1199                 case SCTP_CAUSE_NAT_COLLIDING_STATE:
1200                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
1201                             ch->chunk_flags);
1202                         if (sctp_handle_nat_colliding_state(stcb)) {
1203                                 return (0);
1204                         }
1205                         break;
1206                 case SCTP_CAUSE_NAT_MISSING_STATE:
1207                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
1208                             ch->chunk_flags);
1209                         if (sctp_handle_nat_missing_state(stcb, net)) {
1210                                 return (0);
1211                         }
1212                         break;
1213                 case SCTP_CAUSE_STALE_COOKIE:
1214                         /*
1215                          * We only act if we have echoed a cookie and are
1216                          * waiting.
1217                          */
1218                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
1219                                 int *p;
1220
1221                                 p = (int *)((caddr_t)phdr + sizeof(*phdr));
1222                                 /* Save the time doubled */
1223                                 asoc->cookie_preserve_req = ntohl(*p) << 1;
1224                                 asoc->stale_cookie_count++;
1225                                 if (asoc->stale_cookie_count >
1226                                     asoc->max_init_times) {
1227                                         sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED);
1228                                         /* now free the asoc */
1229 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1230                                         so = SCTP_INP_SO(stcb->sctp_ep);
1231                                         atomic_add_int(&stcb->asoc.refcnt, 1);
1232                                         SCTP_TCB_UNLOCK(stcb);
1233                                         SCTP_SOCKET_LOCK(so, 1);
1234                                         SCTP_TCB_LOCK(stcb);
1235                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1236 #endif
1237                                         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1238                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
1239 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1240                                         SCTP_SOCKET_UNLOCK(so, 1);
1241 #endif
1242                                         return (-1);
1243                                 }
1244                                 /* blast back to INIT state */
1245                                 sctp_toss_old_cookies(stcb, &stcb->asoc);
1246                                 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED;
1247                                 asoc->state |= SCTP_STATE_COOKIE_WAIT;
1248                                 sctp_stop_all_cookie_timers(stcb);
1249                                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1250                         }
1251                         break;
1252                 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1253                         /*
1254                          * Nothing we can do here, we don't do hostname
1255                          * addresses so if the peer does not like my IPv6
1256                          * (or IPv4 for that matter) it does not matter. If
1257                          * they don't support that type of address, they can
1258                          * NOT possibly get that packet type... i.e. with no
1259                          * IPv6 you can't receive a IPv6 packet. so we can
1260                          * safely ignore this one. If we ever added support
1261                          * for HOSTNAME Addresses, then we would need to do
1262                          * something here.
1263                          */
1264                         break;
1265                 case SCTP_CAUSE_UNRECOG_CHUNK:
1266                         sctp_process_unrecog_chunk(stcb, phdr, net);
1267                         break;
1268                 case SCTP_CAUSE_UNRECOG_PARAM:
1269                         sctp_process_unrecog_param(stcb, phdr);
1270                         break;
1271                 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1272                         /*
1273                          * We ignore this since the timer will drive out a
1274                          * new cookie anyway and there timer will drive us
1275                          * to send a SHUTDOWN_COMPLETE. We can't send one
1276                          * here since we don't have their tag.
1277                          */
1278                         break;
1279                 case SCTP_CAUSE_DELETING_LAST_ADDR:
1280                 case SCTP_CAUSE_RESOURCE_SHORTAGE:
1281                 case SCTP_CAUSE_DELETING_SRC_ADDR:
1282                         /*
1283                          * We should NOT get these here, but in a
1284                          * ASCONF-ACK.
1285                          */
1286                         SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n",
1287                             error_type);
1288                         break;
1289                 case SCTP_CAUSE_OUT_OF_RESC:
1290                         /*
1291                          * And what, pray tell do we do with the fact that
1292                          * the peer is out of resources? Not really sure we
1293                          * could do anything but abort. I suspect this
1294                          * should have came WITH an abort instead of in a
1295                          * OP-ERROR.
1296                          */
1297                         break;
1298                 default:
1299                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n",
1300                             error_type);
1301                         break;
1302                 }
1303                 adjust = SCTP_SIZE32(error_len);
1304                 chklen -= adjust;
1305                 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust);
1306         }
1307         sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED);
1308         return (0);
1309 }
1310
1311 static int
1312 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1313     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
1314     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1315     struct sctp_nets *net, int *abort_no_unlock,
1316     uint8_t mflowtype, uint32_t mflowid,
1317     uint32_t vrf_id)
1318 {
1319         struct sctp_init_ack *init_ack;
1320         struct mbuf *op_err;
1321
1322         SCTPDBG(SCTP_DEBUG_INPUT2,
1323             "sctp_handle_init_ack: handling INIT-ACK\n");
1324
1325         if (stcb == NULL) {
1326                 SCTPDBG(SCTP_DEBUG_INPUT2,
1327                     "sctp_handle_init_ack: TCB is null\n");
1328                 return (-1);
1329         }
1330         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
1331                 /* Invalid length */
1332                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1333                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1334                     src, dst, sh, op_err,
1335                     mflowtype, mflowid,
1336                     vrf_id, net->port);
1337                 *abort_no_unlock = 1;
1338                 return (-1);
1339         }
1340         init_ack = &cp->init;
1341         /* validate parameters */
1342         if (init_ack->initiate_tag == 0) {
1343                 /* protocol error... send an abort */
1344                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1345                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1346                     src, dst, sh, op_err,
1347                     mflowtype, mflowid,
1348                     vrf_id, net->port);
1349                 *abort_no_unlock = 1;
1350                 return (-1);
1351         }
1352         if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
1353                 /* protocol error... send an abort */
1354                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1355                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1356                     src, dst, sh, op_err,
1357                     mflowtype, mflowid,
1358                     vrf_id, net->port);
1359                 *abort_no_unlock = 1;
1360                 return (-1);
1361         }
1362         if (init_ack->num_inbound_streams == 0) {
1363                 /* protocol error... send an abort */
1364                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1365                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1366                     src, dst, sh, op_err,
1367                     mflowtype, mflowid,
1368                     vrf_id, net->port);
1369                 *abort_no_unlock = 1;
1370                 return (-1);
1371         }
1372         if (init_ack->num_outbound_streams == 0) {
1373                 /* protocol error... send an abort */
1374                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1375                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1376                     src, dst, sh, op_err,
1377                     mflowtype, mflowid,
1378                     vrf_id, net->port);
1379                 *abort_no_unlock = 1;
1380                 return (-1);
1381         }
1382         /* process according to association state... */
1383         switch (stcb->asoc.state & SCTP_STATE_MASK) {
1384         case SCTP_STATE_COOKIE_WAIT:
1385                 /* this is the expected state for this chunk */
1386                 /* process the INIT-ACK parameters */
1387                 if (stcb->asoc.primary_destination->dest_state &
1388                     SCTP_ADDR_UNCONFIRMED) {
1389                         /*
1390                          * The primary is where we sent the INIT, we can
1391                          * always consider it confirmed when the INIT-ACK is
1392                          * returned. Do this before we load addresses
1393                          * though.
1394                          */
1395                         stcb->asoc.primary_destination->dest_state &=
1396                             ~SCTP_ADDR_UNCONFIRMED;
1397                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1398                             stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1399                 }
1400                 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb,
1401                     net, abort_no_unlock,
1402                     mflowtype, mflowid,
1403                     vrf_id) < 0) {
1404                         /* error in parsing parameters */
1405                         return (-1);
1406                 }
1407                 /* update our state */
1408                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1409                 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED);
1410
1411                 /* reset the RTO calc */
1412                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1413                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1414                             stcb->asoc.overall_error_count,
1415                             0,
1416                             SCTP_FROM_SCTP_INPUT,
1417                             __LINE__);
1418                 }
1419                 stcb->asoc.overall_error_count = 0;
1420                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1421                 /*
1422                  * collapse the init timer back in case of a exponential
1423                  * backoff
1424                  */
1425                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1426                     stcb, net);
1427                 /*
1428                  * the send at the end of the inbound data processing will
1429                  * cause the cookie to be sent
1430                  */
1431                 break;
1432         case SCTP_STATE_SHUTDOWN_SENT:
1433                 /* incorrect state... discard */
1434                 break;
1435         case SCTP_STATE_COOKIE_ECHOED:
1436                 /* incorrect state... discard */
1437                 break;
1438         case SCTP_STATE_OPEN:
1439                 /* incorrect state... discard */
1440                 break;
1441         case SCTP_STATE_EMPTY:
1442         case SCTP_STATE_INUSE:
1443         default:
1444                 /* incorrect state... discard */
1445                 return (-1);
1446                 break;
1447         }
1448         SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1449         return (0);
1450 }
1451
1452 static struct sctp_tcb *
1453 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1454     struct sockaddr *src, struct sockaddr *dst,
1455     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1456     struct sctp_inpcb *inp, struct sctp_nets **netp,
1457     struct sockaddr *init_src, int *notification,
1458     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1459     uint8_t mflowtype, uint32_t mflowid,
1460     uint32_t vrf_id, uint16_t port);
1461
1462
1463 /*
1464  * handle a state cookie for an existing association m: input packet mbuf
1465  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1466  * "split" mbuf and the cookie signature does not exist offset: offset into
1467  * mbuf to the cookie-echo chunk
1468  */
1469 static struct sctp_tcb *
1470 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1471     struct sockaddr *src, struct sockaddr *dst,
1472     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1473     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1474     struct sockaddr *init_src, int *notification,
1475     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1476     uint8_t mflowtype, uint32_t mflowid,
1477     uint32_t vrf_id, uint16_t port)
1478 {
1479         struct sctp_association *asoc;
1480         struct sctp_init_chunk *init_cp, init_buf;
1481         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1482         struct sctp_nets *net;
1483         struct mbuf *op_err;
1484         int init_offset, initack_offset, i;
1485         int retval;
1486         int spec_flag = 0;
1487         uint32_t how_indx;
1488
1489 #if defined(SCTP_DETAILED_STR_STATS)
1490         int j;
1491
1492 #endif
1493
1494         net = *netp;
1495         /* I know that the TCB is non-NULL from the caller */
1496         asoc = &stcb->asoc;
1497         for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
1498                 if (asoc->cookie_how[how_indx] == 0)
1499                         break;
1500         }
1501         if (how_indx < sizeof(asoc->cookie_how)) {
1502                 asoc->cookie_how[how_indx] = 1;
1503         }
1504         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1505                 /* SHUTDOWN came in after sending INIT-ACK */
1506                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1507                 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, "");
1508                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
1509                     mflowtype, mflowid, inp->fibnum,
1510                     vrf_id, net->port);
1511                 if (how_indx < sizeof(asoc->cookie_how))
1512                         asoc->cookie_how[how_indx] = 2;
1513                 return (NULL);
1514         }
1515         /*
1516          * find and validate the INIT chunk in the cookie (peer's info) the
1517          * INIT should start after the cookie-echo header struct (chunk
1518          * header, state cookie header struct)
1519          */
1520         init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1521
1522         init_cp = (struct sctp_init_chunk *)
1523             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1524             (uint8_t *) & init_buf);
1525         if (init_cp == NULL) {
1526                 /* could not pull a INIT chunk in cookie */
1527                 return (NULL);
1528         }
1529         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1530                 return (NULL);
1531         }
1532         /*
1533          * find and validate the INIT-ACK chunk in the cookie (my info) the
1534          * INIT-ACK follows the INIT chunk
1535          */
1536         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1537         initack_cp = (struct sctp_init_ack_chunk *)
1538             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1539             (uint8_t *) & initack_buf);
1540         if (initack_cp == NULL) {
1541                 /* could not pull INIT-ACK chunk in cookie */
1542                 return (NULL);
1543         }
1544         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1545                 return (NULL);
1546         }
1547         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1548             (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1549                 /*
1550                  * case D in Section 5.2.4 Table 2: MMAA process accordingly
1551                  * to get into the OPEN state
1552                  */
1553                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1554                         /*-
1555                          * Opps, this means that we somehow generated two vtag's
1556                          * the same. I.e. we did:
1557                          *  Us               Peer
1558                          *   <---INIT(tag=a)------
1559                          *   ----INIT-ACK(tag=t)-->
1560                          *   ----INIT(tag=t)------> *1
1561                          *   <---INIT-ACK(tag=a)---
1562                          *   <----CE(tag=t)------------- *2
1563                          *
1564                          * At point *1 we should be generating a different
1565                          * tag t'. Which means we would throw away the CE and send
1566                          * ours instead. Basically this is case C (throw away side).
1567                          */
1568                         if (how_indx < sizeof(asoc->cookie_how))
1569                                 asoc->cookie_how[how_indx] = 17;
1570                         return (NULL);
1571
1572                 }
1573                 switch (SCTP_GET_STATE(asoc)) {
1574                 case SCTP_STATE_COOKIE_WAIT:
1575                 case SCTP_STATE_COOKIE_ECHOED:
1576                         /*
1577                          * INIT was sent but got a COOKIE_ECHO with the
1578                          * correct tags... just accept it...but we must
1579                          * process the init so that we can make sure we have
1580                          * the right seq no's.
1581                          */
1582                         /* First we must process the INIT !! */
1583                         retval = sctp_process_init(init_cp, stcb);
1584                         if (retval < 0) {
1585                                 if (how_indx < sizeof(asoc->cookie_how))
1586                                         asoc->cookie_how[how_indx] = 3;
1587                                 return (NULL);
1588                         }
1589                         /* we have already processed the INIT so no problem */
1590                         sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp,
1591                             stcb, net,
1592                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
1593                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp,
1594                             stcb, net,
1595                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
1596                         /* update current state */
1597                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1598                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1599                         else
1600                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1601
1602                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1603                         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1604                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1605                                     stcb->sctp_ep, stcb, asoc->primary_destination);
1606                         }
1607                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1608                         sctp_stop_all_cookie_timers(stcb);
1609                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1610                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1611                             (inp->sctp_socket->so_qlimit == 0)
1612                             ) {
1613 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1614                                 struct socket *so;
1615
1616 #endif
1617                                 /*
1618                                  * Here is where collision would go if we
1619                                  * did a connect() and instead got a
1620                                  * init/init-ack/cookie done before the
1621                                  * init-ack came back..
1622                                  */
1623                                 stcb->sctp_ep->sctp_flags |=
1624                                     SCTP_PCB_FLAGS_CONNECTED;
1625 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1626                                 so = SCTP_INP_SO(stcb->sctp_ep);
1627                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1628                                 SCTP_TCB_UNLOCK(stcb);
1629                                 SCTP_SOCKET_LOCK(so, 1);
1630                                 SCTP_TCB_LOCK(stcb);
1631                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1632                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1633                                         SCTP_SOCKET_UNLOCK(so, 1);
1634                                         return (NULL);
1635                                 }
1636 #endif
1637                                 soisconnected(stcb->sctp_socket);
1638 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1639                                 SCTP_SOCKET_UNLOCK(so, 1);
1640 #endif
1641                         }
1642                         /* notify upper layer */
1643                         *notification = SCTP_NOTIFY_ASSOC_UP;
1644                         /*
1645                          * since we did not send a HB make sure we don't
1646                          * double things
1647                          */
1648                         net->hb_responded = 1;
1649                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
1650                             &cookie->time_entered,
1651                             sctp_align_unsafe_makecopy,
1652                             SCTP_RTT_FROM_NON_DATA);
1653
1654                         if (stcb->asoc.sctp_autoclose_ticks &&
1655                             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1656                                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1657                                     inp, stcb, NULL);
1658                         }
1659                         break;
1660                 default:
1661                         /*
1662                          * we're in the OPEN state (or beyond), so peer must
1663                          * have simply lost the COOKIE-ACK
1664                          */
1665                         break;
1666                 }               /* end switch */
1667                 sctp_stop_all_cookie_timers(stcb);
1668                 /*
1669                  * We ignore the return code here.. not sure if we should
1670                  * somehow abort.. but we do have an existing asoc. This
1671                  * really should not fail.
1672                  */
1673                 if (sctp_load_addresses_from_init(stcb, m,
1674                     init_offset + sizeof(struct sctp_init_chunk),
1675                     initack_offset, src, dst, init_src, stcb->asoc.port)) {
1676                         if (how_indx < sizeof(asoc->cookie_how))
1677                                 asoc->cookie_how[how_indx] = 4;
1678                         return (NULL);
1679                 }
1680                 /* respond with a COOKIE-ACK */
1681                 sctp_toss_old_cookies(stcb, asoc);
1682                 sctp_send_cookie_ack(stcb);
1683                 if (how_indx < sizeof(asoc->cookie_how))
1684                         asoc->cookie_how[how_indx] = 5;
1685                 return (stcb);
1686         }
1687         if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1688             ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1689             cookie->tie_tag_my_vtag == 0 &&
1690             cookie->tie_tag_peer_vtag == 0) {
1691                 /*
1692                  * case C in Section 5.2.4 Table 2: XMOO silently discard
1693                  */
1694                 if (how_indx < sizeof(asoc->cookie_how))
1695                         asoc->cookie_how[how_indx] = 6;
1696                 return (NULL);
1697         }
1698         /*
1699          * If nat support, and the below and stcb is established, send back
1700          * a ABORT(colliding state) if we are established.
1701          */
1702         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) &&
1703             (asoc->peer_supports_nat) &&
1704             ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1705             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1706             (asoc->peer_vtag == 0)))) {
1707                 /*
1708                  * Special case - Peer's support nat. We may have two init's
1709                  * that we gave out the same tag on since one was not
1710                  * established.. i.e. we get INIT from host-1 behind the nat
1711                  * and we respond tag-a, we get a INIT from host-2 behind
1712                  * the nat and we get tag-a again. Then we bring up host-1
1713                  * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
1714                  * Now we have colliding state. We must send an abort here
1715                  * with colliding state indication.
1716                  */
1717                 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, "");
1718                 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
1719                     mflowtype, mflowid, inp->fibnum,
1720                     vrf_id, port);
1721                 return (NULL);
1722         }
1723         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1724             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1725             (asoc->peer_vtag == 0))) {
1726                 /*
1727                  * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1728                  * should be ok, re-accept peer info
1729                  */
1730                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1731                         /*
1732                          * Extension of case C. If we hit this, then the
1733                          * random number generator returned the same vtag
1734                          * when we first sent our INIT-ACK and when we later
1735                          * sent our INIT. The side with the seq numbers that
1736                          * are different will be the one that normnally
1737                          * would have hit case C. This in effect "extends"
1738                          * our vtags in this collision case to be 64 bits.
1739                          * The same collision could occur aka you get both
1740                          * vtag and seq number the same twice in a row.. but
1741                          * is much less likely. If it did happen then we
1742                          * would proceed through and bring up the assoc.. we
1743                          * may end up with the wrong stream setup however..
1744                          * which would be bad.. but there is no way to
1745                          * tell.. until we send on a stream that does not
1746                          * exist :-)
1747                          */
1748                         if (how_indx < sizeof(asoc->cookie_how))
1749                                 asoc->cookie_how[how_indx] = 7;
1750
1751                         return (NULL);
1752                 }
1753                 if (how_indx < sizeof(asoc->cookie_how))
1754                         asoc->cookie_how[how_indx] = 8;
1755                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1756                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1757                 sctp_stop_all_cookie_timers(stcb);
1758                 /*
1759                  * since we did not send a HB make sure we don't double
1760                  * things
1761                  */
1762                 net->hb_responded = 1;
1763                 if (stcb->asoc.sctp_autoclose_ticks &&
1764                     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1765                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1766                             NULL);
1767                 }
1768                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1769                 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
1770
1771                 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1772                         /*
1773                          * Ok the peer probably discarded our data (if we
1774                          * echoed a cookie+data). So anything on the
1775                          * sent_queue should be marked for retransmit, we
1776                          * may not get something to kick us so it COULD
1777                          * still take a timeout to move these.. but it can't
1778                          * hurt to mark them.
1779                          */
1780                         struct sctp_tmit_chunk *chk;
1781
1782                         TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1783                                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
1784                                         chk->sent = SCTP_DATAGRAM_RESEND;
1785                                         sctp_flight_size_decrease(chk);
1786                                         sctp_total_flight_decrease(stcb, chk);
1787                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1788                                         spec_flag++;
1789                                 }
1790                         }
1791
1792                 }
1793                 /* process the INIT info (peer's info) */
1794                 retval = sctp_process_init(init_cp, stcb);
1795                 if (retval < 0) {
1796                         if (how_indx < sizeof(asoc->cookie_how))
1797                                 asoc->cookie_how[how_indx] = 9;
1798                         return (NULL);
1799                 }
1800                 if (sctp_load_addresses_from_init(stcb, m,
1801                     init_offset + sizeof(struct sctp_init_chunk),
1802                     initack_offset, src, dst, init_src, stcb->asoc.port)) {
1803                         if (how_indx < sizeof(asoc->cookie_how))
1804                                 asoc->cookie_how[how_indx] = 10;
1805                         return (NULL);
1806                 }
1807                 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) ||
1808                     (asoc->state & SCTP_STATE_COOKIE_ECHOED)) {
1809                         *notification = SCTP_NOTIFY_ASSOC_UP;
1810
1811                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1812                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1813                             (inp->sctp_socket->so_qlimit == 0)) {
1814 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1815                                 struct socket *so;
1816
1817 #endif
1818                                 stcb->sctp_ep->sctp_flags |=
1819                                     SCTP_PCB_FLAGS_CONNECTED;
1820 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1821                                 so = SCTP_INP_SO(stcb->sctp_ep);
1822                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1823                                 SCTP_TCB_UNLOCK(stcb);
1824                                 SCTP_SOCKET_LOCK(so, 1);
1825                                 SCTP_TCB_LOCK(stcb);
1826                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1827                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1828                                         SCTP_SOCKET_UNLOCK(so, 1);
1829                                         return (NULL);
1830                                 }
1831 #endif
1832                                 soisconnected(stcb->sctp_socket);
1833 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1834                                 SCTP_SOCKET_UNLOCK(so, 1);
1835 #endif
1836                         }
1837                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1838                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1839                         else
1840                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1841                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1842                 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1843                         SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1844                 } else {
1845                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1846                 }
1847                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1848                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1849                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1850                             stcb->sctp_ep, stcb, asoc->primary_destination);
1851                 }
1852                 sctp_stop_all_cookie_timers(stcb);
1853                 sctp_toss_old_cookies(stcb, asoc);
1854                 sctp_send_cookie_ack(stcb);
1855                 if (spec_flag) {
1856                         /*
1857                          * only if we have retrans set do we do this. What
1858                          * this call does is get only the COOKIE-ACK out and
1859                          * then when we return the normal call to
1860                          * sctp_chunk_output will get the retrans out behind
1861                          * this.
1862                          */
1863                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1864                 }
1865                 if (how_indx < sizeof(asoc->cookie_how))
1866                         asoc->cookie_how[how_indx] = 11;
1867
1868                 return (stcb);
1869         }
1870         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1871             ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1872             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1873             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1874             cookie->tie_tag_peer_vtag != 0) {
1875                 struct sctpasochead *head;
1876
1877 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1878                 struct socket *so;
1879
1880 #endif
1881
1882                 if (asoc->peer_supports_nat) {
1883                         /*
1884                          * This is a gross gross hack. Just call the
1885                          * cookie_new code since we are allowing a duplicate
1886                          * association. I hope this works...
1887                          */
1888                         return (sctp_process_cookie_new(m, iphlen, offset, src, dst,
1889                             sh, cookie, cookie_len,
1890                             inp, netp, init_src, notification,
1891                             auth_skipped, auth_offset, auth_len,
1892                             mflowtype, mflowid,
1893                             vrf_id, port));
1894                 }
1895                 /*
1896                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1897                  */
1898                 /* temp code */
1899                 if (how_indx < sizeof(asoc->cookie_how))
1900                         asoc->cookie_how[how_indx] = 12;
1901                 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net,
1902                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
1903                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1904                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
1905
1906                 /* notify upper layer */
1907                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1908                 atomic_add_int(&stcb->asoc.refcnt, 1);
1909                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) &&
1910                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1911                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
1912                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1913                 }
1914                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1915                         SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1916                 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
1917                         SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1918                 }
1919                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1920                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1921                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1922                             stcb->sctp_ep, stcb, asoc->primary_destination);
1923
1924                 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) {
1925                         /* move to OPEN state, if not in SHUTDOWN_SENT */
1926                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1927                 }
1928                 asoc->pre_open_streams =
1929                     ntohs(initack_cp->init.num_outbound_streams);
1930                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1931                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1932                 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1933
1934                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1935
1936                 asoc->str_reset_seq_in = asoc->init_seq_number;
1937
1938                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1939                 if (asoc->mapping_array) {
1940                         memset(asoc->mapping_array, 0,
1941                             asoc->mapping_array_size);
1942                 }
1943                 if (asoc->nr_mapping_array) {
1944                         memset(asoc->nr_mapping_array, 0,
1945                             asoc->mapping_array_size);
1946                 }
1947                 SCTP_TCB_UNLOCK(stcb);
1948 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1949                 so = SCTP_INP_SO(stcb->sctp_ep);
1950                 SCTP_SOCKET_LOCK(so, 1);
1951 #endif
1952                 SCTP_INP_INFO_WLOCK();
1953                 SCTP_INP_WLOCK(stcb->sctp_ep);
1954                 SCTP_TCB_LOCK(stcb);
1955                 atomic_add_int(&stcb->asoc.refcnt, -1);
1956                 /* send up all the data */
1957                 SCTP_TCB_SEND_LOCK(stcb);
1958
1959                 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED);
1960                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1961                         stcb->asoc.strmout[i].chunks_on_queues = 0;
1962 #if defined(SCTP_DETAILED_STR_STATS)
1963                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
1964                                 asoc->strmout[i].abandoned_sent[j] = 0;
1965                                 asoc->strmout[i].abandoned_unsent[j] = 0;
1966                         }
1967 #else
1968                         asoc->strmout[i].abandoned_sent[0] = 0;
1969                         asoc->strmout[i].abandoned_unsent[0] = 0;
1970 #endif
1971                         stcb->asoc.strmout[i].stream_no = i;
1972                         stcb->asoc.strmout[i].next_sequence_send = 0;
1973                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
1974                 }
1975                 /* process the INIT-ACK info (my info) */
1976                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
1977                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1978
1979                 /* pull from vtag hash */
1980                 LIST_REMOVE(stcb, sctp_asocs);
1981                 /* re-insert to new vtag position */
1982                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
1983                     SCTP_BASE_INFO(hashasocmark))];
1984                 /*
1985                  * put it in the bucket in the vtag hash of assoc's for the
1986                  * system
1987                  */
1988                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
1989
1990                 SCTP_TCB_SEND_UNLOCK(stcb);
1991                 SCTP_INP_WUNLOCK(stcb->sctp_ep);
1992                 SCTP_INP_INFO_WUNLOCK();
1993 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1994                 SCTP_SOCKET_UNLOCK(so, 1);
1995 #endif
1996                 asoc->total_flight = 0;
1997                 asoc->total_flight_count = 0;
1998                 /* process the INIT info (peer's info) */
1999                 retval = sctp_process_init(init_cp, stcb);
2000                 if (retval < 0) {
2001                         if (how_indx < sizeof(asoc->cookie_how))
2002                                 asoc->cookie_how[how_indx] = 13;
2003
2004                         return (NULL);
2005                 }
2006                 /*
2007                  * since we did not send a HB make sure we don't double
2008                  * things
2009                  */
2010                 net->hb_responded = 1;
2011
2012                 if (sctp_load_addresses_from_init(stcb, m,
2013                     init_offset + sizeof(struct sctp_init_chunk),
2014                     initack_offset, src, dst, init_src, stcb->asoc.port)) {
2015                         if (how_indx < sizeof(asoc->cookie_how))
2016                                 asoc->cookie_how[how_indx] = 14;
2017
2018                         return (NULL);
2019                 }
2020                 /* respond with a COOKIE-ACK */
2021                 sctp_stop_all_cookie_timers(stcb);
2022                 sctp_toss_old_cookies(stcb, asoc);
2023                 sctp_send_cookie_ack(stcb);
2024                 if (how_indx < sizeof(asoc->cookie_how))
2025                         asoc->cookie_how[how_indx] = 15;
2026
2027                 return (stcb);
2028         }
2029         if (how_indx < sizeof(asoc->cookie_how))
2030                 asoc->cookie_how[how_indx] = 16;
2031         /* all other cases... */
2032         return (NULL);
2033 }
2034
2035
2036 /*
2037  * handle a state cookie for a new association m: input packet mbuf chain--
2038  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
2039  * and the cookie signature does not exist offset: offset into mbuf to the
2040  * cookie-echo chunk length: length of the cookie chunk to: where the init
2041  * was from returns a new TCB
2042  */
2043 static struct sctp_tcb *
2044 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
2045     struct sockaddr *src, struct sockaddr *dst,
2046     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
2047     struct sctp_inpcb *inp, struct sctp_nets **netp,
2048     struct sockaddr *init_src, int *notification,
2049     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2050     uint8_t mflowtype, uint32_t mflowid,
2051     uint32_t vrf_id, uint16_t port)
2052 {
2053         struct sctp_tcb *stcb;
2054         struct sctp_init_chunk *init_cp, init_buf;
2055         struct sctp_init_ack_chunk *initack_cp, initack_buf;
2056         union sctp_sockstore store;
2057         struct sctp_association *asoc;
2058         int init_offset, initack_offset, initack_limit;
2059         int retval;
2060         int error = 0;
2061         uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE];
2062
2063 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2064         struct socket *so;
2065
2066         so = SCTP_INP_SO(inp);
2067 #endif
2068
2069         /*
2070          * find and validate the INIT chunk in the cookie (peer's info) the
2071          * INIT should start after the cookie-echo header struct (chunk
2072          * header, state cookie header struct)
2073          */
2074         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
2075         init_cp = (struct sctp_init_chunk *)
2076             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
2077             (uint8_t *) & init_buf);
2078         if (init_cp == NULL) {
2079                 /* could not pull a INIT chunk in cookie */
2080                 SCTPDBG(SCTP_DEBUG_INPUT1,
2081                     "process_cookie_new: could not pull INIT chunk hdr\n");
2082                 return (NULL);
2083         }
2084         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
2085                 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
2086                 return (NULL);
2087         }
2088         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
2089         /*
2090          * find and validate the INIT-ACK chunk in the cookie (my info) the
2091          * INIT-ACK follows the INIT chunk
2092          */
2093         initack_cp = (struct sctp_init_ack_chunk *)
2094             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
2095             (uint8_t *) & initack_buf);
2096         if (initack_cp == NULL) {
2097                 /* could not pull INIT-ACK chunk in cookie */
2098                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
2099                 return (NULL);
2100         }
2101         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
2102                 return (NULL);
2103         }
2104         /*
2105          * NOTE: We can't use the INIT_ACK's chk_length to determine the
2106          * "initack_limit" value.  This is because the chk_length field
2107          * includes the length of the cookie, but the cookie is omitted when
2108          * the INIT and INIT_ACK are tacked onto the cookie...
2109          */
2110         initack_limit = offset + cookie_len;
2111
2112         /*
2113          * now that we know the INIT/INIT-ACK are in place, create a new TCB
2114          * and popluate
2115          */
2116
2117         /*
2118          * Here we do a trick, we set in NULL for the proc/thread argument.
2119          * We do this since in effect we only use the p argument when the
2120          * socket is unbound and we must do an implicit bind. Since we are
2121          * getting a cookie, we cannot be unbound.
2122          */
2123         stcb = sctp_aloc_assoc(inp, init_src, &error,
2124             ntohl(initack_cp->init.initiate_tag), vrf_id,
2125             ntohs(initack_cp->init.num_outbound_streams),
2126             port,
2127             (struct thread *)NULL
2128             );
2129         if (stcb == NULL) {
2130                 struct mbuf *op_err;
2131
2132                 /* memory problem? */
2133                 SCTPDBG(SCTP_DEBUG_INPUT1,
2134                     "process_cookie_new: no room for another TCB!\n");
2135                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2136                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2137                     src, dst, sh, op_err,
2138                     mflowtype, mflowid,
2139                     vrf_id, port);
2140                 return (NULL);
2141         }
2142         /* get the correct sctp_nets */
2143         if (netp)
2144                 *netp = sctp_findnet(stcb, init_src);
2145
2146         asoc = &stcb->asoc;
2147         /* get scope variables out of cookie */
2148         asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
2149         asoc->scope.site_scope = cookie->site_scope;
2150         asoc->scope.local_scope = cookie->local_scope;
2151         asoc->scope.loopback_scope = cookie->loopback_scope;
2152
2153         if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2154             (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2155                 struct mbuf *op_err;
2156
2157                 /*
2158                  * Houston we have a problem. The EP changed while the
2159                  * cookie was in flight. Only recourse is to abort the
2160                  * association.
2161                  */
2162                 atomic_add_int(&stcb->asoc.refcnt, 1);
2163                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2164                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2165                     src, dst, sh, op_err,
2166                     mflowtype, mflowid,
2167                     vrf_id, port);
2168 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2169                 SCTP_TCB_UNLOCK(stcb);
2170                 SCTP_SOCKET_LOCK(so, 1);
2171                 SCTP_TCB_LOCK(stcb);
2172 #endif
2173                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2174                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2175 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2176                 SCTP_SOCKET_UNLOCK(so, 1);
2177 #endif
2178                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2179                 return (NULL);
2180         }
2181         /* process the INIT-ACK info (my info) */
2182         asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2183         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2184         asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
2185         asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
2186         asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
2187         asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
2188         asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
2189         asoc->str_reset_seq_in = asoc->init_seq_number;
2190
2191         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
2192
2193         /* process the INIT info (peer's info) */
2194         if (netp)
2195                 retval = sctp_process_init(init_cp, stcb);
2196         else
2197                 retval = 0;
2198         if (retval < 0) {
2199                 atomic_add_int(&stcb->asoc.refcnt, 1);
2200 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2201                 SCTP_TCB_UNLOCK(stcb);
2202                 SCTP_SOCKET_LOCK(so, 1);
2203                 SCTP_TCB_LOCK(stcb);
2204 #endif
2205                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2206                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2207 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2208                 SCTP_SOCKET_UNLOCK(so, 1);
2209 #endif
2210                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2211                 return (NULL);
2212         }
2213         /* load all addresses */
2214         if (sctp_load_addresses_from_init(stcb, m,
2215             init_offset + sizeof(struct sctp_init_chunk), initack_offset,
2216             src, dst, init_src, port)) {
2217                 atomic_add_int(&stcb->asoc.refcnt, 1);
2218 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2219                 SCTP_TCB_UNLOCK(stcb);
2220                 SCTP_SOCKET_LOCK(so, 1);
2221                 SCTP_TCB_LOCK(stcb);
2222 #endif
2223                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2224                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2225 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2226                 SCTP_SOCKET_UNLOCK(so, 1);
2227 #endif
2228                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2229                 return (NULL);
2230         }
2231         /*
2232          * verify any preceding AUTH chunk that was skipped
2233          */
2234         /* pull the local authentication parameters from the cookie/init-ack */
2235         sctp_auth_get_cookie_params(stcb, m,
2236             initack_offset + sizeof(struct sctp_init_ack_chunk),
2237             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2238         if (auth_skipped) {
2239                 struct sctp_auth_chunk *auth;
2240
2241                 auth = (struct sctp_auth_chunk *)
2242                     sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2243                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2244                         /* auth HMAC failed, dump the assoc and packet */
2245                         SCTPDBG(SCTP_DEBUG_AUTH1,
2246                             "COOKIE-ECHO: AUTH failed\n");
2247                         atomic_add_int(&stcb->asoc.refcnt, 1);
2248 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2249                         SCTP_TCB_UNLOCK(stcb);
2250                         SCTP_SOCKET_LOCK(so, 1);
2251                         SCTP_TCB_LOCK(stcb);
2252 #endif
2253                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2254                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_21);
2255 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2256                         SCTP_SOCKET_UNLOCK(so, 1);
2257 #endif
2258                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2259                         return (NULL);
2260                 } else {
2261                         /* remaining chunks checked... good to go */
2262                         stcb->asoc.authenticated = 1;
2263                 }
2264         }
2265         /* update current state */
2266         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2267         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2268         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2269                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2270                     stcb->sctp_ep, stcb, asoc->primary_destination);
2271         }
2272         sctp_stop_all_cookie_timers(stcb);
2273         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2274         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2275
2276         /*
2277          * if we're doing ASCONFs, check to see if we have any new local
2278          * addresses that need to get added to the peer (eg. addresses
2279          * changed while cookie echo in flight).  This needs to be done
2280          * after we go to the OPEN state to do the correct asconf
2281          * processing. else, make sure we have the correct addresses in our
2282          * lists
2283          */
2284
2285         /* warning, we re-use sin, sin6, sa_store here! */
2286         /* pull in local_address (our "from" address) */
2287         switch (cookie->laddr_type) {
2288 #ifdef INET
2289         case SCTP_IPV4_ADDRESS:
2290                 /* source addr is IPv4 */
2291                 memset(&store.sin, 0, sizeof(struct sockaddr_in));
2292                 store.sin.sin_family = AF_INET;
2293                 store.sin.sin_len = sizeof(struct sockaddr_in);
2294                 store.sin.sin_addr.s_addr = cookie->laddress[0];
2295                 break;
2296 #endif
2297 #ifdef INET6
2298         case SCTP_IPV6_ADDRESS:
2299                 /* source addr is IPv6 */
2300                 memset(&store.sin6, 0, sizeof(struct sockaddr_in6));
2301                 store.sin6.sin6_family = AF_INET6;
2302                 store.sin6.sin6_len = sizeof(struct sockaddr_in6);
2303                 store.sin6.sin6_scope_id = cookie->scope_id;
2304                 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr));
2305                 break;
2306 #endif
2307         default:
2308                 atomic_add_int(&stcb->asoc.refcnt, 1);
2309 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2310                 SCTP_TCB_UNLOCK(stcb);
2311                 SCTP_SOCKET_LOCK(so, 1);
2312                 SCTP_TCB_LOCK(stcb);
2313 #endif
2314                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2315                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
2316 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2317                 SCTP_SOCKET_UNLOCK(so, 1);
2318 #endif
2319                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2320                 return (NULL);
2321         }
2322
2323         /* set up to notify upper layer */
2324         *notification = SCTP_NOTIFY_ASSOC_UP;
2325         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2326             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2327             (inp->sctp_socket->so_qlimit == 0)) {
2328                 /*
2329                  * This is an endpoint that called connect() how it got a
2330                  * cookie that is NEW is a bit of a mystery. It must be that
2331                  * the INIT was sent, but before it got there.. a complete
2332                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
2333                  * should have went to the other code.. not here.. oh well..
2334                  * a bit of protection is worth having..
2335                  */
2336                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2337 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2338                 atomic_add_int(&stcb->asoc.refcnt, 1);
2339                 SCTP_TCB_UNLOCK(stcb);
2340                 SCTP_SOCKET_LOCK(so, 1);
2341                 SCTP_TCB_LOCK(stcb);
2342                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2343                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2344                         SCTP_SOCKET_UNLOCK(so, 1);
2345                         return (NULL);
2346                 }
2347 #endif
2348                 soisconnected(stcb->sctp_socket);
2349 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2350                 SCTP_SOCKET_UNLOCK(so, 1);
2351 #endif
2352         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2353             (inp->sctp_socket->so_qlimit)) {
2354                 /*
2355                  * We don't want to do anything with this one. Since it is
2356                  * the listening guy. The timer will get started for
2357                  * accepted connections in the caller.
2358                  */
2359                 ;
2360         }
2361         /* since we did not send a HB make sure we don't double things */
2362         if ((netp) && (*netp))
2363                 (*netp)->hb_responded = 1;
2364
2365         if (stcb->asoc.sctp_autoclose_ticks &&
2366             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2367                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2368         }
2369         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2370         if ((netp != NULL) && (*netp != NULL)) {
2371                 /* calculate the RTT and set the encaps port */
2372                 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp,
2373                     &cookie->time_entered, sctp_align_unsafe_makecopy,
2374                     SCTP_RTT_FROM_NON_DATA);
2375         }
2376         /* respond with a COOKIE-ACK */
2377         sctp_send_cookie_ack(stcb);
2378
2379         /*
2380          * check the address lists for any ASCONFs that need to be sent
2381          * AFTER the cookie-ack is sent
2382          */
2383         sctp_check_address_list(stcb, m,
2384             initack_offset + sizeof(struct sctp_init_ack_chunk),
2385             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2386             &store.sa, cookie->local_scope, cookie->site_scope,
2387             cookie->ipv4_scope, cookie->loopback_scope);
2388
2389
2390         return (stcb);
2391 }
2392
2393 /*
2394  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2395  * we NEED to make sure we are not already using the vtag. If so we
2396  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2397         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2398                                                             SCTP_BASE_INFO(hashasocmark))];
2399         LIST_FOREACH(stcb, head, sctp_asocs) {
2400                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
2401                        -- SEND ABORT - TRY AGAIN --
2402                 }
2403         }
2404 */
2405
2406 /*
2407  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2408  * existing (non-NULL) TCB
2409  */
2410 static struct mbuf *
2411 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2412     struct sockaddr *src, struct sockaddr *dst,
2413     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2414     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2415     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2416     struct sctp_tcb **locked_tcb,
2417     uint8_t mflowtype, uint32_t mflowid,
2418     uint32_t vrf_id, uint16_t port)
2419 {
2420         struct sctp_state_cookie *cookie;
2421         struct sctp_tcb *l_stcb = *stcb;
2422         struct sctp_inpcb *l_inp;
2423         struct sockaddr *to;
2424         struct sctp_pcb *ep;
2425         struct mbuf *m_sig;
2426         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2427         uint8_t *sig;
2428         uint8_t cookie_ok = 0;
2429         unsigned int sig_offset, cookie_offset;
2430         unsigned int cookie_len;
2431         struct timeval now;
2432         struct timeval time_expires;
2433         int notification = 0;
2434         struct sctp_nets *netl;
2435         int had_a_existing_tcb = 0;
2436         int send_int_conf = 0;
2437
2438 #ifdef INET
2439         struct sockaddr_in sin;
2440
2441 #endif
2442 #ifdef INET6
2443         struct sockaddr_in6 sin6;
2444
2445 #endif
2446
2447         SCTPDBG(SCTP_DEBUG_INPUT2,
2448             "sctp_handle_cookie: handling COOKIE-ECHO\n");
2449
2450         if (inp_p == NULL) {
2451                 return (NULL);
2452         }
2453         cookie = &cp->cookie;
2454         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2455         cookie_len = ntohs(cp->ch.chunk_length);
2456
2457         if ((cookie->peerport != sh->src_port) ||
2458             (cookie->myport != sh->dest_port) ||
2459             (cookie->my_vtag != sh->v_tag)) {
2460                 /*
2461                  * invalid ports or bad tag.  Note that we always leave the
2462                  * v_tag in the header in network order and when we stored
2463                  * it in the my_vtag slot we also left it in network order.
2464                  * This maintains the match even though it may be in the
2465                  * opposite byte order of the machine :->
2466                  */
2467                 return (NULL);
2468         }
2469         if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2470             sizeof(struct sctp_init_chunk) +
2471             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2472                 /* cookie too small */
2473                 return (NULL);
2474         }
2475         /*
2476          * split off the signature into its own mbuf (since it should not be
2477          * calculated in the sctp_hmac_m() call).
2478          */
2479         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2480         m_sig = m_split(m, sig_offset, M_NOWAIT);
2481         if (m_sig == NULL) {
2482                 /* out of memory or ?? */
2483                 return (NULL);
2484         }
2485 #ifdef SCTP_MBUF_LOGGING
2486         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2487                 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT);
2488         }
2489 #endif
2490
2491         /*
2492          * compute the signature/digest for the cookie
2493          */
2494         ep = &(*inp_p)->sctp_ep;
2495         l_inp = *inp_p;
2496         if (l_stcb) {
2497                 SCTP_TCB_UNLOCK(l_stcb);
2498         }
2499         SCTP_INP_RLOCK(l_inp);
2500         if (l_stcb) {
2501                 SCTP_TCB_LOCK(l_stcb);
2502         }
2503         /* which cookie is it? */
2504         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2505             (ep->current_secret_number != ep->last_secret_number)) {
2506                 /* it's the old cookie */
2507                 (void)sctp_hmac_m(SCTP_HMAC,
2508                     (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2509                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2510         } else {
2511                 /* it's the current cookie */
2512                 (void)sctp_hmac_m(SCTP_HMAC,
2513                     (uint8_t *) ep->secret_key[(int)ep->current_secret_number],
2514                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2515         }
2516         /* get the signature */
2517         SCTP_INP_RUNLOCK(l_inp);
2518         sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig);
2519         if (sig == NULL) {
2520                 /* couldn't find signature */
2521                 sctp_m_freem(m_sig);
2522                 return (NULL);
2523         }
2524         /* compare the received digest with the computed digest */
2525         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2526                 /* try the old cookie? */
2527                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2528                     (ep->current_secret_number != ep->last_secret_number)) {
2529                         /* compute digest with old */
2530                         (void)sctp_hmac_m(SCTP_HMAC,
2531                             (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2532                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2533                         /* compare */
2534                         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2535                                 cookie_ok = 1;
2536                 }
2537         } else {
2538                 cookie_ok = 1;
2539         }
2540
2541         /*
2542          * Now before we continue we must reconstruct our mbuf so that
2543          * normal processing of any other chunks will work.
2544          */
2545         {
2546                 struct mbuf *m_at;
2547
2548                 m_at = m;
2549                 while (SCTP_BUF_NEXT(m_at) != NULL) {
2550                         m_at = SCTP_BUF_NEXT(m_at);
2551                 }
2552                 SCTP_BUF_NEXT(m_at) = m_sig;
2553         }
2554
2555         if (cookie_ok == 0) {
2556                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2557                 SCTPDBG(SCTP_DEBUG_INPUT2,
2558                     "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2559                     (uint32_t) offset, cookie_offset, sig_offset);
2560                 return (NULL);
2561         }
2562         /*
2563          * check the cookie timestamps to be sure it's not stale
2564          */
2565         (void)SCTP_GETTIME_TIMEVAL(&now);
2566         /* Expire time is in Ticks, so we convert to seconds */
2567         time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life);
2568         time_expires.tv_usec = cookie->time_entered.tv_usec;
2569         /*
2570          * TODO sctp_constants.h needs alternative time macros when _KERNEL
2571          * is undefined.
2572          */
2573         if (timevalcmp(&now, &time_expires, >)) {
2574                 /* cookie is stale! */
2575                 struct mbuf *op_err;
2576                 struct sctp_error_stale_cookie *cause;
2577                 uint32_t tim;
2578
2579                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie),
2580                     0, M_NOWAIT, 1, MT_DATA);
2581                 if (op_err == NULL) {
2582                         /* FOOBAR */
2583                         return (NULL);
2584                 }
2585                 /* Set the len */
2586                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie);
2587                 cause = mtod(op_err, struct sctp_error_stale_cookie *);
2588                 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE);
2589                 cause->cause.length = htons((sizeof(struct sctp_paramhdr) +
2590                     (sizeof(uint32_t))));
2591                 /* seconds to usec */
2592                 tim = (now.tv_sec - time_expires.tv_sec) * 1000000;
2593                 /* add in usec */
2594                 if (tim == 0)
2595                         tim = now.tv_usec - cookie->time_entered.tv_usec;
2596                 cause->stale_time = htonl(tim);
2597                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
2598                     mflowtype, mflowid, l_inp->fibnum,
2599                     vrf_id, port);
2600                 return (NULL);
2601         }
2602         /*
2603          * Now we must see with the lookup address if we have an existing
2604          * asoc. This will only happen if we were in the COOKIE-WAIT state
2605          * and a INIT collided with us and somewhere the peer sent the
2606          * cookie on another address besides the single address our assoc
2607          * had for him. In this case we will have one of the tie-tags set at
2608          * least AND the address field in the cookie can be used to look it
2609          * up.
2610          */
2611         to = NULL;
2612         switch (cookie->addr_type) {
2613 #ifdef INET6
2614         case SCTP_IPV6_ADDRESS:
2615                 memset(&sin6, 0, sizeof(sin6));
2616                 sin6.sin6_family = AF_INET6;
2617                 sin6.sin6_len = sizeof(sin6);
2618                 sin6.sin6_port = sh->src_port;
2619                 sin6.sin6_scope_id = cookie->scope_id;
2620                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2621                     sizeof(sin6.sin6_addr.s6_addr));
2622                 to = (struct sockaddr *)&sin6;
2623                 break;
2624 #endif
2625 #ifdef INET
2626         case SCTP_IPV4_ADDRESS:
2627                 memset(&sin, 0, sizeof(sin));
2628                 sin.sin_family = AF_INET;
2629                 sin.sin_len = sizeof(sin);
2630                 sin.sin_port = sh->src_port;
2631                 sin.sin_addr.s_addr = cookie->address[0];
2632                 to = (struct sockaddr *)&sin;
2633                 break;
2634 #endif
2635         default:
2636                 /* This should not happen */
2637                 return (NULL);
2638         }
2639         if (*stcb == NULL) {
2640                 /* Yep, lets check */
2641                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
2642                 if (*stcb == NULL) {
2643                         /*
2644                          * We should have only got back the same inp. If we
2645                          * got back a different ep we have a problem. The
2646                          * original findep got back l_inp and now
2647                          */
2648                         if (l_inp != *inp_p) {
2649                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2650                         }
2651                 } else {
2652                         if (*locked_tcb == NULL) {
2653                                 /*
2654                                  * In this case we found the assoc only
2655                                  * after we locked the create lock. This
2656                                  * means we are in a colliding case and we
2657                                  * must make sure that we unlock the tcb if
2658                                  * its one of the cases where we throw away
2659                                  * the incoming packets.
2660                                  */
2661                                 *locked_tcb = *stcb;
2662
2663                                 /*
2664                                  * We must also increment the inp ref count
2665                                  * since the ref_count flags was set when we
2666                                  * did not find the TCB, now we found it
2667                                  * which reduces the refcount.. we must
2668                                  * raise it back out to balance it all :-)
2669                                  */
2670                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2671                                 if ((*stcb)->sctp_ep != l_inp) {
2672                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2673                                             (void *)(*stcb)->sctp_ep, (void *)l_inp);
2674                                 }
2675                         }
2676                 }
2677         }
2678         cookie_len -= SCTP_SIGNATURE_SIZE;
2679         if (*stcb == NULL) {
2680                 /* this is the "normal" case... get a new TCB */
2681                 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
2682                     cookie, cookie_len, *inp_p,
2683                     netp, to, &notification,
2684                     auth_skipped, auth_offset, auth_len,
2685                     mflowtype, mflowid,
2686                     vrf_id, port);
2687         } else {
2688                 /* this is abnormal... cookie-echo on existing TCB */
2689                 had_a_existing_tcb = 1;
2690                 *stcb = sctp_process_cookie_existing(m, iphlen, offset,
2691                     src, dst, sh,
2692                     cookie, cookie_len, *inp_p, *stcb, netp, to,
2693                     &notification, auth_skipped, auth_offset, auth_len,
2694                     mflowtype, mflowid,
2695                     vrf_id, port);
2696         }
2697
2698         if (*stcb == NULL) {
2699                 /* still no TCB... must be bad cookie-echo */
2700                 return (NULL);
2701         }
2702         if (*netp != NULL) {
2703                 (*netp)->flowtype = mflowtype;
2704                 (*netp)->flowid = mflowid;
2705         }
2706         /*
2707          * Ok, we built an association so confirm the address we sent the
2708          * INIT-ACK to.
2709          */
2710         netl = sctp_findnet(*stcb, to);
2711         /*
2712          * This code should in theory NOT run but
2713          */
2714         if (netl == NULL) {
2715                 /* TSNH! Huh, why do I need to add this address here? */
2716                 if (sctp_add_remote_addr(*stcb, to, NULL, port,
2717                     SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
2718                         return (NULL);
2719                 }
2720                 netl = sctp_findnet(*stcb, to);
2721         }
2722         if (netl) {
2723                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2724                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2725                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2726                             netl);
2727                         send_int_conf = 1;
2728                 }
2729         }
2730         sctp_start_net_timers(*stcb);
2731         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2732                 if (!had_a_existing_tcb ||
2733                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2734                         /*
2735                          * If we have a NEW cookie or the connect never
2736                          * reached the connected state during collision we
2737                          * must do the TCP accept thing.
2738                          */
2739                         struct socket *so, *oso;
2740                         struct sctp_inpcb *inp;
2741
2742                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2743                                 /*
2744                                  * For a restart we will keep the same
2745                                  * socket, no need to do anything. I THINK!!
2746                                  */
2747                                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2748                                 if (send_int_conf) {
2749                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2750                                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2751                                 }
2752                                 return (m);
2753                         }
2754                         oso = (*inp_p)->sctp_socket;
2755                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2756                         SCTP_TCB_UNLOCK((*stcb));
2757                         CURVNET_SET(oso->so_vnet);
2758                         so = sonewconn(oso, 0
2759                             );
2760                         CURVNET_RESTORE();
2761                         SCTP_TCB_LOCK((*stcb));
2762                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2763
2764                         if (so == NULL) {
2765                                 struct mbuf *op_err;
2766
2767 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2768                                 struct socket *pcb_so;
2769
2770 #endif
2771                                 /* Too many sockets */
2772                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2773                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2774                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
2775                                     src, dst, sh, op_err,
2776                                     mflowtype, mflowid,
2777                                     vrf_id, port);
2778 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2779                                 pcb_so = SCTP_INP_SO(*inp_p);
2780                                 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2781                                 SCTP_TCB_UNLOCK((*stcb));
2782                                 SCTP_SOCKET_LOCK(pcb_so, 1);
2783                                 SCTP_TCB_LOCK((*stcb));
2784                                 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2785 #endif
2786                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC,
2787                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
2788 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2789                                 SCTP_SOCKET_UNLOCK(pcb_so, 1);
2790 #endif
2791                                 return (NULL);
2792                         }
2793                         inp = (struct sctp_inpcb *)so->so_pcb;
2794                         SCTP_INP_INCR_REF(inp);
2795                         /*
2796                          * We add the unbound flag here so that if we get an
2797                          * soabort() before we get the move_pcb done, we
2798                          * will properly cleanup.
2799                          */
2800                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2801                             SCTP_PCB_FLAGS_CONNECTED |
2802                             SCTP_PCB_FLAGS_IN_TCPPOOL |
2803                             SCTP_PCB_FLAGS_UNBOUND |
2804                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2805                             SCTP_PCB_FLAGS_DONT_WAKE);
2806                         inp->sctp_features = (*inp_p)->sctp_features;
2807                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2808                         inp->sctp_socket = so;
2809                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2810                         inp->max_cwnd = (*inp_p)->max_cwnd;
2811                         inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2812                         inp->ecn_supported = (*inp_p)->ecn_supported;
2813                         inp->prsctp_supported = (*inp_p)->prsctp_supported;
2814                         inp->auth_supported = (*inp_p)->auth_supported;
2815                         inp->asconf_supported = (*inp_p)->asconf_supported;
2816                         inp->reconfig_supported = (*inp_p)->reconfig_supported;
2817                         inp->nrsack_supported = (*inp_p)->nrsack_supported;
2818                         inp->pktdrop_supported = (*inp_p)->pktdrop_supported;
2819                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2820                         inp->sctp_context = (*inp_p)->sctp_context;
2821                         inp->local_strreset_support = (*inp_p)->local_strreset_support;
2822                         inp->fibnum = (*inp_p)->fibnum;
2823                         inp->inp_starting_point_for_iterator = NULL;
2824                         /*
2825                          * copy in the authentication parameters from the
2826                          * original endpoint
2827                          */
2828                         if (inp->sctp_ep.local_hmacs)
2829                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2830                         inp->sctp_ep.local_hmacs =
2831                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2832                         if (inp->sctp_ep.local_auth_chunks)
2833                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2834                         inp->sctp_ep.local_auth_chunks =
2835                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2836
2837                         /*
2838                          * Now we must move it from one hash table to
2839                          * another and get the tcb in the right place.
2840                          */
2841
2842                         /*
2843                          * This is where the one-2-one socket is put into
2844                          * the accept state waiting for the accept!
2845                          */
2846                         if (*stcb) {
2847                                 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE;
2848                         }
2849                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2850
2851                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2852                         SCTP_TCB_UNLOCK((*stcb));
2853
2854                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2855                             0);
2856                         SCTP_TCB_LOCK((*stcb));
2857                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2858
2859
2860                         /*
2861                          * now we must check to see if we were aborted while
2862                          * the move was going on and the lock/unlock
2863                          * happened.
2864                          */
2865                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2866                                 /*
2867                                  * yep it was, we leave the assoc attached
2868                                  * to the socket since the sctp_inpcb_free()
2869                                  * call will send an abort for us.
2870                                  */
2871                                 SCTP_INP_DECR_REF(inp);
2872                                 return (NULL);
2873                         }
2874                         SCTP_INP_DECR_REF(inp);
2875                         /* Switch over to the new guy */
2876                         *inp_p = inp;
2877                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2878                         if (send_int_conf) {
2879                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2880                                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2881                         }
2882                         /*
2883                          * Pull it from the incomplete queue and wake the
2884                          * guy
2885                          */
2886 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2887                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2888                         SCTP_TCB_UNLOCK((*stcb));
2889                         SCTP_SOCKET_LOCK(so, 1);
2890 #endif
2891                         soisconnected(so);
2892 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2893                         SCTP_TCB_LOCK((*stcb));
2894                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2895                         SCTP_SOCKET_UNLOCK(so, 1);
2896 #endif
2897                         return (m);
2898                 }
2899         }
2900         if (notification) {
2901                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2902         }
2903         if (send_int_conf) {
2904                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2905                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2906         }
2907         return (m);
2908 }
2909
2910 static void
2911 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
2912     struct sctp_tcb *stcb, struct sctp_nets *net)
2913 {
2914         /* cp must not be used, others call this without a c-ack :-) */
2915         struct sctp_association *asoc;
2916
2917         SCTPDBG(SCTP_DEBUG_INPUT2,
2918             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2919         if ((stcb == NULL) || (net == NULL)) {
2920                 return;
2921         }
2922         asoc = &stcb->asoc;
2923
2924         sctp_stop_all_cookie_timers(stcb);
2925         /* process according to association state */
2926         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
2927                 /* state change only needed when I am in right state */
2928                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2929                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2930                 sctp_start_net_timers(stcb);
2931                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2932                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2933                             stcb->sctp_ep, stcb, asoc->primary_destination);
2934
2935                 }
2936                 /* update RTO */
2937                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2938                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2939                 if (asoc->overall_error_count == 0) {
2940                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
2941                             &asoc->time_entered, sctp_align_safe_nocopy,
2942                             SCTP_RTT_FROM_NON_DATA);
2943                 }
2944                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2945                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2946                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2947                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2948 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2949                         struct socket *so;
2950
2951 #endif
2952                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2953 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2954                         so = SCTP_INP_SO(stcb->sctp_ep);
2955                         atomic_add_int(&stcb->asoc.refcnt, 1);
2956                         SCTP_TCB_UNLOCK(stcb);
2957                         SCTP_SOCKET_LOCK(so, 1);
2958                         SCTP_TCB_LOCK(stcb);
2959                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2960 #endif
2961                         if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
2962                                 soisconnected(stcb->sctp_socket);
2963                         }
2964 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2965                         SCTP_SOCKET_UNLOCK(so, 1);
2966 #endif
2967                 }
2968                 /*
2969                  * since we did not send a HB make sure we don't double
2970                  * things
2971                  */
2972                 net->hb_responded = 1;
2973
2974                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2975                         /*
2976                          * We don't need to do the asconf thing, nor hb or
2977                          * autoclose if the socket is closed.
2978                          */
2979                         goto closed_socket;
2980                 }
2981                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
2982                     stcb, net);
2983
2984
2985                 if (stcb->asoc.sctp_autoclose_ticks &&
2986                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2987                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
2988                             stcb->sctp_ep, stcb, NULL);
2989                 }
2990                 /*
2991                  * send ASCONF if parameters are pending and ASCONFs are
2992                  * allowed (eg. addresses changed when init/cookie echo were
2993                  * in flight)
2994                  */
2995                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
2996                     (stcb->asoc.asconf_supported == 1) &&
2997                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
2998 #ifdef SCTP_TIMER_BASED_ASCONF
2999                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
3000                             stcb->sctp_ep, stcb,
3001                             stcb->asoc.primary_destination);
3002 #else
3003                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
3004                             SCTP_ADDR_NOT_LOCKED);
3005 #endif
3006                 }
3007         }
3008 closed_socket:
3009         /* Toss the cookie if I can */
3010         sctp_toss_old_cookies(stcb, asoc);
3011         if (!TAILQ_EMPTY(&asoc->sent_queue)) {
3012                 /* Restart the timer if we have pending data */
3013                 struct sctp_tmit_chunk *chk;
3014
3015                 chk = TAILQ_FIRST(&asoc->sent_queue);
3016                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
3017         }
3018 }
3019
3020 static void
3021 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
3022     struct sctp_tcb *stcb)
3023 {
3024         struct sctp_nets *net;
3025         struct sctp_tmit_chunk *lchk;
3026         struct sctp_ecne_chunk bkup;
3027         uint8_t override_bit;
3028         uint32_t tsn, window_data_tsn;
3029         int len;
3030         unsigned int pkt_cnt;
3031
3032         len = ntohs(cp->ch.chunk_length);
3033         if ((len != sizeof(struct sctp_ecne_chunk)) &&
3034             (len != sizeof(struct old_sctp_ecne_chunk))) {
3035                 return;
3036         }
3037         if (len == sizeof(struct old_sctp_ecne_chunk)) {
3038                 /* Its the old format */
3039                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
3040                 bkup.num_pkts_since_cwr = htonl(1);
3041                 cp = &bkup;
3042         }
3043         SCTP_STAT_INCR(sctps_recvecne);
3044         tsn = ntohl(cp->tsn);
3045         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
3046         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
3047         if (lchk == NULL) {
3048                 window_data_tsn = stcb->asoc.sending_seq - 1;
3049         } else {
3050                 window_data_tsn = lchk->rec.data.TSN_seq;
3051         }
3052
3053         /* Find where it was sent to if possible. */
3054         net = NULL;
3055         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
3056                 if (lchk->rec.data.TSN_seq == tsn) {
3057                         net = lchk->whoTo;
3058                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
3059                         break;
3060                 }
3061                 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) {
3062                         break;
3063                 }
3064         }
3065         if (net == NULL) {
3066                 /*
3067                  * What to do. A previous send of a CWR was possibly lost.
3068                  * See how old it is, we may have it marked on the actual
3069                  * net.
3070                  */
3071                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
3072                         if (tsn == net->last_cwr_tsn) {
3073                                 /* Found him, send it off */
3074                                 break;
3075                         }
3076                 }
3077                 if (net == NULL) {
3078                         /*
3079                          * If we reach here, we need to send a special CWR
3080                          * that says hey, we did this a long time ago and
3081                          * you lost the response.
3082                          */
3083                         net = TAILQ_FIRST(&stcb->asoc.nets);
3084                         if (net == NULL) {
3085                                 /* TSNH */
3086                                 return;
3087                         }
3088                         override_bit = SCTP_CWR_REDUCE_OVERRIDE;
3089                 } else {
3090                         override_bit = 0;
3091                 }
3092         } else {
3093                 override_bit = 0;
3094         }
3095         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
3096             ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3097                 /*
3098                  * JRS - Use the congestion control given in the pluggable
3099                  * CC module
3100                  */
3101                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
3102                 /*
3103                  * We reduce once every RTT. So we will only lower cwnd at
3104                  * the next sending seq i.e. the window_data_tsn
3105                  */
3106                 net->cwr_window_tsn = window_data_tsn;
3107                 net->ecn_ce_pkt_cnt += pkt_cnt;
3108                 net->lost_cnt = pkt_cnt;
3109                 net->last_cwr_tsn = tsn;
3110         } else {
3111                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
3112                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
3113                     ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3114                         /*
3115                          * Another loss in the same window update how many
3116                          * marks/packets lost we have had.
3117                          */
3118                         int cnt = 1;
3119
3120                         if (pkt_cnt > net->lost_cnt) {
3121                                 /* Should be the case */
3122                                 cnt = (pkt_cnt - net->lost_cnt);
3123                                 net->ecn_ce_pkt_cnt += cnt;
3124                         }
3125                         net->lost_cnt = pkt_cnt;
3126                         net->last_cwr_tsn = tsn;
3127                         /*
3128                          * Most CC functions will ignore this call, since we
3129                          * are in-window yet of the initial CE the peer saw.
3130                          */
3131                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
3132                 }
3133         }
3134         /*
3135          * We always send a CWR this way if our previous one was lost our
3136          * peer will get an update, or if it is not time again to reduce we
3137          * still get the cwr to the peer. Note we set the override when we
3138          * could not find the TSN on the chunk or the destination network.
3139          */
3140         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
3141 }
3142
3143 static void
3144 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
3145 {
3146         /*
3147          * Here we get a CWR from the peer. We must look in the outqueue and
3148          * make sure that we have a covered ECNE in the control chunk part.
3149          * If so remove it.
3150          */
3151         struct sctp_tmit_chunk *chk;
3152         struct sctp_ecne_chunk *ecne;
3153         int override;
3154         uint32_t cwr_tsn;
3155
3156         cwr_tsn = ntohl(cp->tsn);
3157         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
3158         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
3159                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
3160                         continue;
3161                 }
3162                 if ((override == 0) && (chk->whoTo != net)) {
3163                         /* Must be from the right src unless override is set */
3164                         continue;
3165                 }
3166                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
3167                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
3168                         /* this covers this ECNE, we can remove it */
3169                         stcb->asoc.ecn_echo_cnt_onq--;
3170                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
3171                             sctp_next);
3172                         sctp_m_freem(chk->data);
3173                         chk->data = NULL;
3174                         stcb->asoc.ctrl_queue_cnt--;
3175                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3176                         if (override == 0) {
3177                                 break;
3178                         }
3179                 }
3180         }
3181 }
3182
3183 static void
3184 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
3185     struct sctp_tcb *stcb, struct sctp_nets *net)
3186 {
3187         struct sctp_association *asoc;
3188
3189 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3190         struct socket *so;
3191
3192 #endif
3193
3194         SCTPDBG(SCTP_DEBUG_INPUT2,
3195             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3196         if (stcb == NULL)
3197                 return;
3198
3199         asoc = &stcb->asoc;
3200         /* process according to association state */
3201         if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3202                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3203                 SCTPDBG(SCTP_DEBUG_INPUT2,
3204                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3205                 SCTP_TCB_UNLOCK(stcb);
3206                 return;
3207         }
3208         /* notify upper layer protocol */
3209         if (stcb->sctp_socket) {
3210                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3211         }
3212 #ifdef INVARIANTS
3213         if (!TAILQ_EMPTY(&asoc->send_queue) ||
3214             !TAILQ_EMPTY(&asoc->sent_queue) ||
3215             !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
3216                 panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
3217         }
3218 #endif
3219         /* stop the timer */
3220         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net,
3221             SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3222         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3223         /* free the TCB */
3224         SCTPDBG(SCTP_DEBUG_INPUT2,
3225             "sctp_handle_shutdown_complete: calls free-asoc\n");
3226 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3227         so = SCTP_INP_SO(stcb->sctp_ep);
3228         atomic_add_int(&stcb->asoc.refcnt, 1);
3229         SCTP_TCB_UNLOCK(stcb);
3230         SCTP_SOCKET_LOCK(so, 1);
3231         SCTP_TCB_LOCK(stcb);
3232         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3233 #endif
3234         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
3235             SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3236 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3237         SCTP_SOCKET_UNLOCK(so, 1);
3238 #endif
3239         return;
3240 }
3241
3242 static int
3243 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3244     struct sctp_nets *net, uint8_t flg)
3245 {
3246         switch (desc->chunk_type) {
3247         case SCTP_DATA:
3248                 /* find the tsn to resend (possibly */
3249                 {
3250                         uint32_t tsn;
3251                         struct sctp_tmit_chunk *tp1;
3252
3253                         tsn = ntohl(desc->tsn_ifany);
3254                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3255                                 if (tp1->rec.data.TSN_seq == tsn) {
3256                                         /* found it */
3257                                         break;
3258                                 }
3259                                 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) {
3260                                         /* not found */
3261                                         tp1 = NULL;
3262                                         break;
3263                                 }
3264                         }
3265                         if (tp1 == NULL) {
3266                                 /*
3267                                  * Do it the other way , aka without paying
3268                                  * attention to queue seq order.
3269                                  */
3270                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3271                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3272                                         if (tp1->rec.data.TSN_seq == tsn) {
3273                                                 /* found it */
3274                                                 break;
3275                                         }
3276                                 }
3277                         }
3278                         if (tp1 == NULL) {
3279                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
3280                         }
3281                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3282                                 uint8_t *ddp;
3283
3284                                 if (((flg & SCTP_BADCRC) == 0) &&
3285                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3286                                         return (0);
3287                                 }
3288                                 if ((stcb->asoc.peers_rwnd == 0) &&
3289                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3290                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
3291                                         return (0);
3292                                 }
3293                                 if (stcb->asoc.peers_rwnd == 0 &&
3294                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
3295                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
3296                                         return (0);
3297                                 }
3298                                 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+
3299                                     sizeof(struct sctp_data_chunk));
3300                                 {
3301                                         unsigned int iii;
3302
3303                                         for (iii = 0; iii < sizeof(desc->data_bytes);
3304                                             iii++) {
3305                                                 if (ddp[iii] != desc->data_bytes[iii]) {
3306                                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3307                                                         return (-1);
3308                                                 }
3309                                         }
3310                                 }
3311
3312                                 if (tp1->do_rtt) {
3313                                         /*
3314                                          * this guy had a RTO calculation
3315                                          * pending on it, cancel it
3316                                          */
3317                                         if (tp1->whoTo->rto_needed == 0) {
3318                                                 tp1->whoTo->rto_needed = 1;
3319                                         }
3320                                         tp1->do_rtt = 0;
3321                                 }
3322                                 SCTP_STAT_INCR(sctps_pdrpmark);
3323                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3324                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3325                                 /*
3326                                  * mark it as if we were doing a FR, since
3327                                  * we will be getting gap ack reports behind
3328                                  * the info from the router.
3329                                  */
3330                                 tp1->rec.data.doing_fast_retransmit = 1;
3331                                 /*
3332                                  * mark the tsn with what sequences can
3333                                  * cause a new FR.
3334                                  */
3335                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3336                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3337                                 } else {
3338                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
3339                                 }
3340
3341                                 /* restart the timer */
3342                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3343                                     stcb, tp1->whoTo,
3344                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3345                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3346                                     stcb, tp1->whoTo);
3347
3348                                 /* fix counts and things */
3349                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3350                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3351                                             tp1->whoTo->flight_size,
3352                                             tp1->book_size,
3353                                             (uint32_t) (uintptr_t) stcb,
3354                                             tp1->rec.data.TSN_seq);
3355                                 }
3356                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3357                                         sctp_flight_size_decrease(tp1);
3358                                         sctp_total_flight_decrease(stcb, tp1);
3359                                 }
3360                                 tp1->sent = SCTP_DATAGRAM_RESEND;
3361                         } {
3362                                 /* audit code */
3363                                 unsigned int audit;
3364
3365                                 audit = 0;
3366                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3367                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3368                                                 audit++;
3369                                 }
3370                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3371                                     sctp_next) {
3372                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3373                                                 audit++;
3374                                 }
3375                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3376                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3377                                             audit, stcb->asoc.sent_queue_retran_cnt);
3378 #ifndef SCTP_AUDITING_ENABLED
3379                                         stcb->asoc.sent_queue_retran_cnt = audit;
3380 #endif
3381                                 }
3382                         }
3383                 }
3384                 break;
3385         case SCTP_ASCONF:
3386                 {
3387                         struct sctp_tmit_chunk *asconf;
3388
3389                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3390                             sctp_next) {
3391                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3392                                         break;
3393                                 }
3394                         }
3395                         if (asconf) {
3396                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3397                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3398                                 asconf->sent = SCTP_DATAGRAM_RESEND;
3399                                 asconf->snd_count--;
3400                         }
3401                 }
3402                 break;
3403         case SCTP_INITIATION:
3404                 /* resend the INIT */
3405                 stcb->asoc.dropped_special_cnt++;
3406                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3407                         /*
3408                          * If we can get it in, in a few attempts we do
3409                          * this, otherwise we let the timer fire.
3410                          */
3411                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3412                             stcb, net,
3413                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
3414                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3415                 }
3416                 break;
3417         case SCTP_SELECTIVE_ACK:
3418         case SCTP_NR_SELECTIVE_ACK:
3419                 /* resend the sack */
3420                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3421                 break;
3422         case SCTP_HEARTBEAT_REQUEST:
3423                 /* resend a demand HB */
3424                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3425                         /*
3426                          * Only retransmit if we KNOW we wont destroy the
3427                          * tcb
3428                          */
3429                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3430                 }
3431                 break;
3432         case SCTP_SHUTDOWN:
3433                 sctp_send_shutdown(stcb, net);
3434                 break;
3435         case SCTP_SHUTDOWN_ACK:
3436                 sctp_send_shutdown_ack(stcb, net);
3437                 break;
3438         case SCTP_COOKIE_ECHO:
3439                 {
3440                         struct sctp_tmit_chunk *cookie;
3441
3442                         cookie = NULL;
3443                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3444                             sctp_next) {
3445                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3446                                         break;
3447                                 }
3448                         }
3449                         if (cookie) {
3450                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3451                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3452                                 cookie->sent = SCTP_DATAGRAM_RESEND;
3453                                 sctp_stop_all_cookie_timers(stcb);
3454                         }
3455                 }
3456                 break;
3457         case SCTP_COOKIE_ACK:
3458                 sctp_send_cookie_ack(stcb);
3459                 break;
3460         case SCTP_ASCONF_ACK:
3461                 /* resend last asconf ack */
3462                 sctp_send_asconf_ack(stcb);
3463                 break;
3464         case SCTP_IFORWARD_CUM_TSN:
3465         case SCTP_FORWARD_CUM_TSN:
3466                 send_forward_tsn(stcb, &stcb->asoc);
3467                 break;
3468                 /* can't do anything with these */
3469         case SCTP_PACKET_DROPPED:
3470         case SCTP_INITIATION_ACK:       /* this should not happen */
3471         case SCTP_HEARTBEAT_ACK:
3472         case SCTP_ABORT_ASSOCIATION:
3473         case SCTP_OPERATION_ERROR:
3474         case SCTP_SHUTDOWN_COMPLETE:
3475         case SCTP_ECN_ECHO:
3476         case SCTP_ECN_CWR:
3477         default:
3478                 break;
3479         }
3480         return (0);
3481 }
3482
3483 void
3484 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
3485 {
3486         uint32_t i;
3487         uint16_t temp;
3488
3489         /*
3490          * We set things to 0xffffffff since this is the last delivered
3491          * sequence and we will be sending in 0 after the reset.
3492          */
3493
3494         if (number_entries) {
3495                 for (i = 0; i < number_entries; i++) {
3496                         temp = ntohs(list[i]);
3497                         if (temp >= stcb->asoc.streamincnt) {
3498                                 continue;
3499                         }
3500                         stcb->asoc.strmin[temp].last_sequence_delivered = 0xffffffff;
3501                 }
3502         } else {
3503                 list = NULL;
3504                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3505                         stcb->asoc.strmin[i].last_sequence_delivered = 0xffffffff;
3506                 }
3507         }
3508         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3509 }
3510
3511 static void
3512 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
3513 {
3514         uint32_t i;
3515         uint16_t temp;
3516
3517         if (number_entries > 0) {
3518                 for (i = 0; i < number_entries; i++) {
3519                         temp = ntohs(list[i]);
3520                         if (temp >= stcb->asoc.streamoutcnt) {
3521                                 /* no such stream */
3522                                 continue;
3523                         }
3524                         stcb->asoc.strmout[temp].next_sequence_send = 0;
3525                 }
3526         } else {
3527                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3528                         stcb->asoc.strmout[i].next_sequence_send = 0;
3529                 }
3530         }
3531         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3532 }
3533
3534 static void
3535 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
3536 {
3537         uint32_t i;
3538         uint16_t temp;
3539
3540         if (number_entries > 0) {
3541                 for (i = 0; i < number_entries; i++) {
3542                         temp = ntohs(list[i]);
3543                         if (temp >= stcb->asoc.streamoutcnt) {
3544                                 /* no such stream */
3545                                 continue;
3546                         }
3547                         stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN;
3548                 }
3549         } else {
3550                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3551                         stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN;
3552                 }
3553         }
3554 }
3555
3556
3557 struct sctp_stream_reset_request *
3558 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3559 {
3560         struct sctp_association *asoc;
3561         struct sctp_chunkhdr *ch;
3562         struct sctp_stream_reset_request *r;
3563         struct sctp_tmit_chunk *chk;
3564         int len, clen;
3565
3566         asoc = &stcb->asoc;
3567         if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3568                 asoc->stream_reset_outstanding = 0;
3569                 return (NULL);
3570         }
3571         if (stcb->asoc.str_reset == NULL) {
3572                 asoc->stream_reset_outstanding = 0;
3573                 return (NULL);
3574         }
3575         chk = stcb->asoc.str_reset;
3576         if (chk->data == NULL) {
3577                 return (NULL);
3578         }
3579         if (bchk) {
3580                 /* he wants a copy of the chk pointer */
3581                 *bchk = chk;
3582         }
3583         clen = chk->send_size;
3584         ch = mtod(chk->data, struct sctp_chunkhdr *);
3585         r = (struct sctp_stream_reset_request *)(ch + 1);
3586         if (ntohl(r->request_seq) == seq) {
3587                 /* found it */
3588                 return (r);
3589         }
3590         len = SCTP_SIZE32(ntohs(r->ph.param_length));
3591         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3592                 /* move to the next one, there can only be a max of two */
3593                 r = (struct sctp_stream_reset_request *)((caddr_t)r + len);
3594                 if (ntohl(r->request_seq) == seq) {
3595                         return (r);
3596                 }
3597         }
3598         /* that seq is not here */
3599         return (NULL);
3600 }
3601
3602 static void
3603 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3604 {
3605         struct sctp_association *asoc;
3606         struct sctp_tmit_chunk *chk = stcb->asoc.str_reset;
3607
3608         if (stcb->asoc.str_reset == NULL) {
3609                 return;
3610         }
3611         asoc = &stcb->asoc;
3612
3613         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb,
3614             chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28);
3615         TAILQ_REMOVE(&asoc->control_send_queue,
3616             chk,
3617             sctp_next);
3618         if (chk->data) {
3619                 sctp_m_freem(chk->data);
3620                 chk->data = NULL;
3621         }
3622         asoc->ctrl_queue_cnt--;
3623         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3624         /* sa_ignore NO_NULL_CHK */
3625         stcb->asoc.str_reset = NULL;
3626 }
3627
3628
3629 static int
3630 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3631     uint32_t seq, uint32_t action,
3632     struct sctp_stream_reset_response *respin)
3633 {
3634         uint16_t type;
3635         int lparm_len;
3636         struct sctp_association *asoc = &stcb->asoc;
3637         struct sctp_tmit_chunk *chk;
3638         struct sctp_stream_reset_request *req_param;
3639         struct sctp_stream_reset_out_request *req_out_param;
3640         struct sctp_stream_reset_in_request *req_in_param;
3641         uint32_t number_entries;
3642
3643         if (asoc->stream_reset_outstanding == 0) {
3644                 /* duplicate */
3645                 return (0);
3646         }
3647         if (seq == stcb->asoc.str_reset_seq_out) {
3648                 req_param = sctp_find_stream_reset(stcb, seq, &chk);
3649                 if (req_param != NULL) {
3650                         stcb->asoc.str_reset_seq_out++;
3651                         type = ntohs(req_param->ph.param_type);
3652                         lparm_len = ntohs(req_param->ph.param_length);
3653                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
3654                                 int no_clear = 0;
3655
3656                                 req_out_param = (struct sctp_stream_reset_out_request *)req_param;
3657                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3658                                 asoc->stream_reset_out_is_outstanding = 0;
3659                                 if (asoc->stream_reset_outstanding)
3660                                         asoc->stream_reset_outstanding--;
3661                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3662                                         /* do it */
3663                                         sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams);
3664                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3665                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3666                                 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) {
3667                                         /*
3668                                          * Set it up so we don't stop
3669                                          * retransmitting
3670                                          */
3671                                         asoc->stream_reset_outstanding++;
3672                                         stcb->asoc.str_reset_seq_out--;
3673                                         asoc->stream_reset_out_is_outstanding = 1;
3674                                         no_clear = 1;
3675                                 } else {
3676                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3677                                 }
3678                                 if (no_clear == 0) {
3679                                         sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams);
3680                                 }
3681                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3682                                 req_in_param = (struct sctp_stream_reset_in_request *)req_param;
3683                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3684                                 if (asoc->stream_reset_outstanding)
3685                                         asoc->stream_reset_outstanding--;
3686                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3687                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
3688                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3689                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3690                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
3691                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3692                                 }
3693                         } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
3694                                 /* Ok we now may have more streams */
3695                                 int num_stream;
3696
3697                                 num_stream = stcb->asoc.strm_pending_add_size;
3698                                 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
3699                                         /* TSNH */
3700                                         num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
3701                                 }
3702                                 stcb->asoc.strm_pending_add_size = 0;
3703                                 if (asoc->stream_reset_outstanding)
3704                                         asoc->stream_reset_outstanding--;
3705                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3706                                         /* Put the new streams into effect */
3707                                         int i;
3708
3709                                         for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) {
3710                                                 asoc->strmout[i].state = SCTP_STREAM_OPEN;
3711                                         }
3712                                         asoc->streamoutcnt += num_stream;
3713                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3714                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3715                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3716                                             SCTP_STREAM_CHANGE_DENIED);
3717                                 } else {
3718                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3719                                             SCTP_STREAM_CHANGE_FAILED);
3720                                 }
3721                         } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
3722                                 if (asoc->stream_reset_outstanding)
3723                                         asoc->stream_reset_outstanding--;
3724                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3725                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3726                                             SCTP_STREAM_CHANGE_DENIED);
3727                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3728                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3729                                             SCTP_STREAM_CHANGE_FAILED);
3730                                 }
3731                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3732                                 /**
3733                                  * a) Adopt the new in tsn.
3734                                  * b) reset the map
3735                                  * c) Adopt the new out-tsn
3736                                  */
3737                                 struct sctp_stream_reset_response_tsn *resp;
3738                                 struct sctp_forward_tsn_chunk fwdtsn;
3739                                 int abort_flag = 0;
3740
3741                                 if (respin == NULL) {
3742                                         /* huh ? */
3743                                         return (0);
3744                                 }
3745                                 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) {
3746                                         return (0);
3747                                 }
3748                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3749                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
3750                                         asoc->stream_reset_outstanding--;
3751                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3752                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3753                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3754                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3755                                         if (abort_flag) {
3756                                                 return (1);
3757                                         }
3758                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3759                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3760                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3761                                         }
3762                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3763                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3764                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3765
3766                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3767                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3768
3769                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3770                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3771
3772                                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3773                                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3774                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
3775                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3776                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3777                                             SCTP_ASSOC_RESET_DENIED);
3778                                 } else {
3779                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3780                                             SCTP_ASSOC_RESET_FAILED);
3781                                 }
3782                         }
3783                         /* get rid of the request and get the request flags */
3784                         if (asoc->stream_reset_outstanding == 0) {
3785                                 sctp_clean_up_stream_reset(stcb);
3786                         }
3787                 }
3788         }
3789         if (asoc->stream_reset_outstanding == 0) {
3790                 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3791         }
3792         return (0);
3793 }
3794
3795 static void
3796 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3797     struct sctp_tmit_chunk *chk,
3798     struct sctp_stream_reset_in_request *req, int trunc)
3799 {
3800         uint32_t seq;
3801         int len, i;
3802         int number_entries;
3803         uint16_t temp;
3804
3805         /*
3806          * peer wants me to send a str-reset to him for my outgoing seq's if
3807          * seq_in is right.
3808          */
3809         struct sctp_association *asoc = &stcb->asoc;
3810
3811         seq = ntohl(req->request_seq);
3812         if (asoc->str_reset_seq_in == seq) {
3813                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3814                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3815                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3816                 } else if (trunc) {
3817                         /* Can't do it, since they exceeded our buffer size  */
3818                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3819                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3820                         len = ntohs(req->ph.param_length);
3821                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3822                         if (number_entries) {
3823                                 for (i = 0; i < number_entries; i++) {
3824                                         temp = ntohs(req->list_of_streams[i]);
3825                                         if (temp >= stcb->asoc.streamoutcnt) {
3826                                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3827                                                 goto bad_boy;
3828                                         }
3829                                         req->list_of_streams[i] = temp;
3830                                 }
3831                                 for (i = 0; i < number_entries; i++) {
3832                                         if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) {
3833                                                 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING;
3834                                         }
3835                                 }
3836                         } else {
3837                                 /* Its all */
3838                                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3839                                         if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN)
3840                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING;
3841                                 }
3842                         }
3843                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3844                 } else {
3845                         /* Can't do it, since we have sent one out */
3846                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3847                 }
3848 bad_boy:
3849                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3850                 asoc->str_reset_seq_in++;
3851         } else if (asoc->str_reset_seq_in - 1 == seq) {
3852                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3853         } else if (asoc->str_reset_seq_in - 2 == seq) {
3854                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3855         } else {
3856                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3857         }
3858         sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3859 }
3860
3861 static int
3862 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3863     struct sctp_tmit_chunk *chk,
3864     struct sctp_stream_reset_tsn_request *req)
3865 {
3866         /* reset all in and out and update the tsn */
3867         /*
3868          * A) reset my str-seq's on in and out. B) Select a receive next,
3869          * and set cum-ack to it. Also process this selected number as a
3870          * fwd-tsn as well. C) set in the response my next sending seq.
3871          */
3872         struct sctp_forward_tsn_chunk fwdtsn;
3873         struct sctp_association *asoc = &stcb->asoc;
3874         int abort_flag = 0;
3875         uint32_t seq;
3876
3877         seq = ntohl(req->request_seq);
3878         if (asoc->str_reset_seq_in == seq) {
3879                 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
3880                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3881                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3882                 } else {
3883                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3884                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3885                         fwdtsn.ch.chunk_flags = 0;
3886                         fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3887                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3888                         if (abort_flag) {
3889                                 return (1);
3890                         }
3891                         asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3892                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3893                                 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3894                         }
3895                         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
3896                         asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
3897                         memset(asoc->mapping_array, 0, asoc->mapping_array_size);
3898                         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
3899                         memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
3900                         atomic_add_int(&asoc->sending_seq, 1);
3901                         /* save off historical data for retrans */
3902                         asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
3903                         asoc->last_sending_seq[0] = asoc->sending_seq;
3904                         asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
3905                         asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
3906                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3907                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3908                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3909                         sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
3910                 }
3911                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3912                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3913                 asoc->str_reset_seq_in++;
3914         } else if (asoc->str_reset_seq_in - 1 == seq) {
3915                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3916                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3917         } else if (asoc->str_reset_seq_in - 2 == seq) {
3918                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3919                     asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
3920         } else {
3921                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3922         }
3923         return (0);
3924 }
3925
3926 static void
3927 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3928     struct sctp_tmit_chunk *chk,
3929     struct sctp_stream_reset_out_request *req, int trunc)
3930 {
3931         uint32_t seq, tsn;
3932         int number_entries, len;
3933         struct sctp_association *asoc = &stcb->asoc;
3934
3935         seq = ntohl(req->request_seq);
3936
3937         /* now if its not a duplicate we process it */
3938         if (asoc->str_reset_seq_in == seq) {
3939                 len = ntohs(req->ph.param_length);
3940                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3941                 /*
3942                  * the sender is resetting, handle the list issue.. we must
3943                  * a) verify if we can do the reset, if so no problem b) If
3944                  * we can't do the reset we must copy the request. c) queue
3945                  * it, and setup the data in processor to trigger it off
3946                  * when needed and dequeue all the queued data.
3947                  */
3948                 tsn = ntohl(req->send_reset_at_tsn);
3949
3950                 /* move the reset action back one */
3951                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3952                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3953                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3954                 } else if (trunc) {
3955                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3956                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
3957                         /* we can do it now */
3958                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3959                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3960                 } else {
3961                         /*
3962                          * we must queue it up and thus wait for the TSN's
3963                          * to arrive that are at or before tsn
3964                          */
3965                         struct sctp_stream_reset_list *liste;
3966                         int siz;
3967
3968                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
3969                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
3970                             siz, SCTP_M_STRESET);
3971                         if (liste == NULL) {
3972                                 /* gak out of memory */
3973                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3974                                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3975                                 return;
3976                         }
3977                         liste->seq = seq;
3978                         liste->tsn = tsn;
3979                         liste->number_entries = number_entries;
3980                         memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
3981                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
3982                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS;
3983                 }
3984                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3985                 asoc->str_reset_seq_in++;
3986         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3987                 /*
3988                  * one seq back, just echo back last action since my
3989                  * response was lost.
3990                  */
3991                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3992         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3993                 /*
3994                  * two seq back, just echo back last action since my
3995                  * response was lost.
3996                  */
3997                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3998         } else {
3999                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4000         }
4001 }
4002
4003 static void
4004 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
4005     struct sctp_stream_reset_add_strm *str_add)
4006 {
4007         /*
4008          * Peer is requesting to add more streams. If its within our
4009          * max-streams we will allow it.
4010          */
4011         uint32_t num_stream, i;
4012         uint32_t seq;
4013         struct sctp_association *asoc = &stcb->asoc;
4014         struct sctp_queued_to_read *ctl, *nctl;
4015
4016         /* Get the number. */
4017         seq = ntohl(str_add->request_seq);
4018         num_stream = ntohs(str_add->number_of_streams);
4019         /* Now what would be the new total? */
4020         if (asoc->str_reset_seq_in == seq) {
4021                 num_stream += stcb->asoc.streamincnt;
4022                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4023                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4024                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4025                 } else if ((num_stream > stcb->asoc.max_inbound_streams) ||
4026                     (num_stream > 0xffff)) {
4027                         /* We must reject it they ask for to many */
4028         denied:
4029                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4030                 } else {
4031                         /* Ok, we can do that :-) */
4032                         struct sctp_stream_in *oldstrm;
4033
4034                         /* save off the old */
4035                         oldstrm = stcb->asoc.strmin;
4036                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
4037                             (num_stream * sizeof(struct sctp_stream_in)),
4038                             SCTP_M_STRMI);
4039                         if (stcb->asoc.strmin == NULL) {
4040                                 stcb->asoc.strmin = oldstrm;
4041                                 goto denied;
4042                         }
4043                         /* copy off the old data */
4044                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
4045                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
4046                                 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
4047                                 stcb->asoc.strmin[i].stream_no = i;
4048                                 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered;
4049                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
4050                                 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started;
4051                                 /* now anything on those queues? */
4052                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) {
4053                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm);
4054                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm);
4055                                 }
4056                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) {
4057                                         TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm);
4058                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm);
4059                                 }
4060                         }
4061                         /* Init the new streams */
4062                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
4063                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
4064                                 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
4065                                 stcb->asoc.strmin[i].stream_no = i;
4066                                 stcb->asoc.strmin[i].last_sequence_delivered = 0xffffffff;
4067                                 stcb->asoc.strmin[i].pd_api_started = 0;
4068                                 stcb->asoc.strmin[i].delivery_started = 0;
4069                         }
4070                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
4071                         /* update the size */
4072                         stcb->asoc.streamincnt = num_stream;
4073                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4074                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
4075                 }
4076                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4077                 asoc->str_reset_seq_in++;
4078         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4079                 /*
4080                  * one seq back, just echo back last action since my
4081                  * response was lost.
4082                  */
4083                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4084         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4085                 /*
4086                  * two seq back, just echo back last action since my
4087                  * response was lost.
4088                  */
4089                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4090         } else {
4091                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4092
4093         }
4094 }
4095
4096 static void
4097 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
4098     struct sctp_stream_reset_add_strm *str_add)
4099 {
4100         /*
4101          * Peer is requesting to add more streams. If its within our
4102          * max-streams we will allow it.
4103          */
4104         uint16_t num_stream;
4105         uint32_t seq;
4106         struct sctp_association *asoc = &stcb->asoc;
4107
4108         /* Get the number. */
4109         seq = ntohl(str_add->request_seq);
4110         num_stream = ntohs(str_add->number_of_streams);
4111         /* Now what would be the new total? */
4112         if (asoc->str_reset_seq_in == seq) {
4113                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4114                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4115                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4116                 } else if (stcb->asoc.stream_reset_outstanding) {
4117                         /* We must reject it we have something pending */
4118                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
4119                 } else {
4120                         /* Ok, we can do that :-) */
4121                         int mychk;
4122
4123                         mychk = stcb->asoc.streamoutcnt;
4124                         mychk += num_stream;
4125                         if (mychk < 0x10000) {
4126                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4127                                 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) {
4128                                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4129                                 }
4130                         } else {
4131                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4132                         }
4133                 }
4134                 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
4135                 asoc->str_reset_seq_in++;
4136         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4137                 /*
4138                  * one seq back, just echo back last action since my
4139                  * response was lost.
4140                  */
4141                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4142         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4143                 /*
4144                  * two seq back, just echo back last action since my
4145                  * response was lost.
4146                  */
4147                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4148         } else {
4149                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4150         }
4151 }
4152
4153 #ifdef __GNUC__
4154 __attribute__((noinline))
4155 #endif
4156         static int
4157             sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
4158         struct sctp_chunkhdr *ch_req)
4159 {
4160         uint16_t remaining_length, param_len, ptype;
4161         struct sctp_paramhdr pstore;
4162         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
4163         uint32_t seq = 0;
4164         int num_req = 0;
4165         int trunc = 0;
4166         struct sctp_tmit_chunk *chk;
4167         struct sctp_chunkhdr *ch;
4168         struct sctp_paramhdr *ph;
4169         int ret_code = 0;
4170         int num_param = 0;
4171
4172         /* now it may be a reset or a reset-response */
4173         remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr);
4174
4175         /* setup for adding the response */
4176         sctp_alloc_a_chunk(stcb, chk);
4177         if (chk == NULL) {
4178                 return (ret_code);
4179         }
4180         chk->copy_by_ref = 0;
4181         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
4182         chk->rec.chunk_id.can_take_data = 0;
4183         chk->flags = 0;
4184         chk->asoc = &stcb->asoc;
4185         chk->no_fr_allowed = 0;
4186         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
4187         chk->book_size_scale = 0;
4188         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
4189         if (chk->data == NULL) {
4190 strres_nochunk:
4191                 if (chk->data) {
4192                         sctp_m_freem(chk->data);
4193                         chk->data = NULL;
4194                 }
4195                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
4196                 return (ret_code);
4197         }
4198         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
4199
4200         /* setup chunk parameters */
4201         chk->sent = SCTP_DATAGRAM_UNSENT;
4202         chk->snd_count = 0;
4203         chk->whoTo = NULL;
4204
4205         ch = mtod(chk->data, struct sctp_chunkhdr *);
4206         ch->chunk_type = SCTP_STREAM_RESET;
4207         ch->chunk_flags = 0;
4208         ch->chunk_length = htons(chk->send_size);
4209         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
4210         offset += sizeof(struct sctp_chunkhdr);
4211         while (remaining_length >= sizeof(struct sctp_paramhdr)) {
4212                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore);
4213                 if (ph == NULL) {
4214                         /* TSNH */
4215                         break;
4216                 }
4217                 param_len = ntohs(ph->param_length);
4218                 if ((param_len > remaining_length) ||
4219                     (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) {
4220                         /* bad parameter length */
4221                         break;
4222                 }
4223                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)),
4224                     (uint8_t *) & cstore);
4225                 if (ph == NULL) {
4226                         /* TSNH */
4227                         break;
4228                 }
4229                 ptype = ntohs(ph->param_type);
4230                 num_param++;
4231                 if (param_len > sizeof(cstore)) {
4232                         trunc = 1;
4233                 } else {
4234                         trunc = 0;
4235                 }
4236                 if (num_param > SCTP_MAX_RESET_PARAMS) {
4237                         /* hit the max of parameters already sorry.. */
4238                         break;
4239                 }
4240                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4241                         struct sctp_stream_reset_out_request *req_out;
4242
4243                         if (param_len < sizeof(struct sctp_stream_reset_out_request)) {
4244                                 break;
4245                         }
4246                         req_out = (struct sctp_stream_reset_out_request *)ph;
4247                         num_req++;
4248                         if (stcb->asoc.stream_reset_outstanding) {
4249                                 seq = ntohl(req_out->response_seq);
4250                                 if (seq == stcb->asoc.str_reset_seq_out) {
4251                                         /* implicit ack */
4252                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
4253                                 }
4254                         }
4255                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4256                 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
4257                         struct sctp_stream_reset_add_strm *str_add;
4258
4259                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4260                                 break;
4261                         }
4262                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4263                         num_req++;
4264                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4265                 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
4266                         struct sctp_stream_reset_add_strm *str_add;
4267
4268                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4269                                 break;
4270                         }
4271                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4272                         num_req++;
4273                         sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
4274                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4275                         struct sctp_stream_reset_in_request *req_in;
4276
4277                         num_req++;
4278                         req_in = (struct sctp_stream_reset_in_request *)ph;
4279                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4280                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4281                         struct sctp_stream_reset_tsn_request *req_tsn;
4282
4283                         num_req++;
4284                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4285                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4286                                 ret_code = 1;
4287                                 goto strres_nochunk;
4288                         }
4289                         /* no more */
4290                         break;
4291                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4292                         struct sctp_stream_reset_response *resp;
4293                         uint32_t result;
4294
4295                         if (param_len < sizeof(struct sctp_stream_reset_response)) {
4296                                 break;
4297                         }
4298                         resp = (struct sctp_stream_reset_response *)ph;
4299                         seq = ntohl(resp->response_seq);
4300                         result = ntohl(resp->result);
4301                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4302                                 ret_code = 1;
4303                                 goto strres_nochunk;
4304                         }
4305                 } else {
4306                         break;
4307                 }
4308                 offset += SCTP_SIZE32(param_len);
4309                 if (remaining_length >= SCTP_SIZE32(param_len)) {
4310                         remaining_length -= SCTP_SIZE32(param_len);
4311                 } else {
4312                         remaining_length = 0;
4313                 }
4314         }
4315         if (num_req == 0) {
4316                 /* we have no response free the stuff */
4317                 goto strres_nochunk;
4318         }
4319         /* ok we have a chunk to link in */
4320         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4321             chk,
4322             sctp_next);
4323         stcb->asoc.ctrl_queue_cnt++;
4324         return (ret_code);
4325 }
4326
4327 /*
4328  * Handle a router or endpoints report of a packet loss, there are two ways
4329  * to handle this, either we get the whole packet and must disect it
4330  * ourselves (possibly with truncation and or corruption) or it is a summary
4331  * from a middle box that did the disectting for us.
4332  */
4333 static void
4334 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4335     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4336 {
4337         uint32_t bottle_bw, on_queue;
4338         uint16_t trunc_len;
4339         unsigned int chlen;
4340         unsigned int at;
4341         struct sctp_chunk_desc desc;
4342         struct sctp_chunkhdr *ch;
4343
4344         chlen = ntohs(cp->ch.chunk_length);
4345         chlen -= sizeof(struct sctp_pktdrop_chunk);
4346         /* XXX possible chlen underflow */
4347         if (chlen == 0) {
4348                 ch = NULL;
4349                 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
4350                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
4351         } else {
4352                 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
4353                 chlen -= sizeof(struct sctphdr);
4354                 /* XXX possible chlen underflow */
4355                 memset(&desc, 0, sizeof(desc));
4356         }
4357         trunc_len = (uint16_t) ntohs(cp->trunc_len);
4358         if (trunc_len > limit) {
4359                 trunc_len = limit;
4360         }
4361         /* now the chunks themselves */
4362         while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
4363                 desc.chunk_type = ch->chunk_type;
4364                 /* get amount we need to move */
4365                 at = ntohs(ch->chunk_length);
4366                 if (at < sizeof(struct sctp_chunkhdr)) {
4367                         /* corrupt chunk, maybe at the end? */
4368                         SCTP_STAT_INCR(sctps_pdrpcrupt);
4369                         break;
4370                 }
4371                 if (trunc_len == 0) {
4372                         /* we are supposed to have all of it */
4373                         if (at > chlen) {
4374                                 /* corrupt skip it */
4375                                 SCTP_STAT_INCR(sctps_pdrpcrupt);
4376                                 break;
4377                         }
4378                 } else {
4379                         /* is there enough of it left ? */
4380                         if (desc.chunk_type == SCTP_DATA) {
4381                                 if (chlen < (sizeof(struct sctp_data_chunk) +
4382                                     sizeof(desc.data_bytes))) {
4383                                         break;
4384                                 }
4385                         } else {
4386                                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4387                                         break;
4388                                 }
4389                         }
4390                 }
4391                 if (desc.chunk_type == SCTP_DATA) {
4392                         /* can we get out the tsn? */
4393                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4394                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4395
4396                         if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) {
4397                                 /* yep */
4398                                 struct sctp_data_chunk *dcp;
4399                                 uint8_t *ddp;
4400                                 unsigned int iii;
4401
4402                                 dcp = (struct sctp_data_chunk *)ch;
4403                                 ddp = (uint8_t *) (dcp + 1);
4404                                 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
4405                                         desc.data_bytes[iii] = ddp[iii];
4406                                 }
4407                                 desc.tsn_ifany = dcp->dp.tsn;
4408                         } else {
4409                                 /* nope we are done. */
4410                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4411                                 break;
4412                         }
4413                 } else {
4414                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4415                                 SCTP_STAT_INCR(sctps_pdrpmbct);
4416                 }
4417
4418                 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
4419                         SCTP_STAT_INCR(sctps_pdrppdbrk);
4420                         break;
4421                 }
4422                 if (SCTP_SIZE32(at) > chlen) {
4423                         break;
4424                 }
4425                 chlen -= SCTP_SIZE32(at);
4426                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4427                         /* done, none left */
4428                         break;
4429                 }
4430                 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
4431         }
4432         /* Now update any rwnd --- possibly */
4433         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4434                 /* From a peer, we get a rwnd report */
4435                 uint32_t a_rwnd;
4436
4437                 SCTP_STAT_INCR(sctps_pdrpfehos);
4438
4439                 bottle_bw = ntohl(cp->bottle_bw);
4440                 on_queue = ntohl(cp->current_onq);
4441                 if (bottle_bw && on_queue) {
4442                         /* a rwnd report is in here */
4443                         if (bottle_bw > on_queue)
4444                                 a_rwnd = bottle_bw - on_queue;
4445                         else
4446                                 a_rwnd = 0;
4447
4448                         if (a_rwnd == 0)
4449                                 stcb->asoc.peers_rwnd = 0;
4450                         else {
4451                                 if (a_rwnd > stcb->asoc.total_flight) {
4452                                         stcb->asoc.peers_rwnd =
4453                                             a_rwnd - stcb->asoc.total_flight;
4454                                 } else {
4455                                         stcb->asoc.peers_rwnd = 0;
4456                                 }
4457                                 if (stcb->asoc.peers_rwnd <
4458                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4459                                         /* SWS sender side engages */
4460                                         stcb->asoc.peers_rwnd = 0;
4461                                 }
4462                         }
4463                 }
4464         } else {
4465                 SCTP_STAT_INCR(sctps_pdrpfmbox);
4466         }
4467
4468         /* now middle boxes in sat networks get a cwnd bump */
4469         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
4470             (stcb->asoc.sat_t3_loss_recovery == 0) &&
4471             (stcb->asoc.sat_network)) {
4472                 /*
4473                  * This is debatable but for sat networks it makes sense
4474                  * Note if a T3 timer has went off, we will prohibit any
4475                  * changes to cwnd until we exit the t3 loss recovery.
4476                  */
4477                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4478                     net, cp, &bottle_bw, &on_queue);
4479         }
4480 }
4481
4482 /*
4483  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4484  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4485  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4486  * length of the complete packet outputs: - length: modified to remaining
4487  * length after control processing - netp: modified to new sctp_nets after
4488  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4489  * bad packet,...) otherwise return the tcb for this packet
4490  */
4491 #ifdef __GNUC__
4492 __attribute__((noinline))
4493 #endif
4494         static struct sctp_tcb *
4495                  sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4496              struct sockaddr *src, struct sockaddr *dst,
4497              struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4498              struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4499              uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
4500              uint32_t vrf_id, uint16_t port)
4501 {
4502         struct sctp_association *asoc;
4503         struct mbuf *op_err;
4504         char msg[SCTP_DIAG_INFO_LEN];
4505         uint32_t vtag_in;
4506         int num_chunks = 0;     /* number of control chunks processed */
4507         uint32_t chk_length;
4508         int ret;
4509         int abort_no_unlock = 0;
4510         int ecne_seen = 0;
4511
4512         /*
4513          * How big should this be, and should it be alloc'd? Lets try the
4514          * d-mtu-ceiling for now (2k) and that should hopefully work ...
4515          * until we get into jumbo grams and such..
4516          */
4517         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4518         struct sctp_tcb *locked_tcb = stcb;
4519         int got_auth = 0;
4520         uint32_t auth_offset = 0, auth_len = 0;
4521         int auth_skipped = 0;
4522         int asconf_cnt = 0;
4523
4524 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4525         struct socket *so;
4526
4527 #endif
4528
4529         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4530             iphlen, *offset, length, (void *)stcb);
4531
4532         /* validate chunk header length... */
4533         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4534                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4535                     ntohs(ch->chunk_length));
4536                 if (locked_tcb) {
4537                         SCTP_TCB_UNLOCK(locked_tcb);
4538                 }
4539                 return (NULL);
4540         }
4541         /*
4542          * validate the verification tag
4543          */
4544         vtag_in = ntohl(sh->v_tag);
4545
4546         if (locked_tcb) {
4547                 SCTP_TCB_LOCK_ASSERT(locked_tcb);
4548         }
4549         if (ch->chunk_type == SCTP_INITIATION) {
4550                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4551                     ntohs(ch->chunk_length), vtag_in);
4552                 if (vtag_in != 0) {
4553                         /* protocol error- silently discard... */
4554                         SCTP_STAT_INCR(sctps_badvtag);
4555                         if (locked_tcb) {
4556                                 SCTP_TCB_UNLOCK(locked_tcb);
4557                         }
4558                         return (NULL);
4559                 }
4560         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4561                 /*
4562                  * If there is no stcb, skip the AUTH chunk and process
4563                  * later after a stcb is found (to validate the lookup was
4564                  * valid.
4565                  */
4566                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4567                     (stcb == NULL) &&
4568                     (inp->auth_supported == 1)) {
4569                         /* save this chunk for later processing */
4570                         auth_skipped = 1;
4571                         auth_offset = *offset;
4572                         auth_len = ntohs(ch->chunk_length);
4573
4574                         /* (temporarily) move past this chunk */
4575                         *offset += SCTP_SIZE32(auth_len);
4576                         if (*offset >= length) {
4577                                 /* no more data left in the mbuf chain */
4578                                 *offset = length;
4579                                 if (locked_tcb) {
4580                                         SCTP_TCB_UNLOCK(locked_tcb);
4581                                 }
4582                                 return (NULL);
4583                         }
4584                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4585                             sizeof(struct sctp_chunkhdr), chunk_buf);
4586                 }
4587                 if (ch == NULL) {
4588                         /* Help */
4589                         *offset = length;
4590                         if (locked_tcb) {
4591                                 SCTP_TCB_UNLOCK(locked_tcb);
4592                         }
4593                         return (NULL);
4594                 }
4595                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4596                         goto process_control_chunks;
4597                 }
4598                 /*
4599                  * first check if it's an ASCONF with an unknown src addr we
4600                  * need to look inside to find the association
4601                  */
4602                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4603                         struct sctp_chunkhdr *asconf_ch = ch;
4604                         uint32_t asconf_offset = 0, asconf_len = 0;
4605
4606                         /* inp's refcount may be reduced */
4607                         SCTP_INP_INCR_REF(inp);
4608
4609                         asconf_offset = *offset;
4610                         do {
4611                                 asconf_len = ntohs(asconf_ch->chunk_length);
4612                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4613                                         break;
4614                                 stcb = sctp_findassociation_ep_asconf(m,
4615                                     *offset,
4616                                     dst,
4617                                     sh, &inp, netp, vrf_id);
4618                                 if (stcb != NULL)
4619                                         break;
4620                                 asconf_offset += SCTP_SIZE32(asconf_len);
4621                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4622                                     sizeof(struct sctp_chunkhdr), chunk_buf);
4623                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4624                         if (stcb == NULL) {
4625                                 /*
4626                                  * reduce inp's refcount if not reduced in
4627                                  * sctp_findassociation_ep_asconf().
4628                                  */
4629                                 SCTP_INP_DECR_REF(inp);
4630                         } else {
4631                                 locked_tcb = stcb;
4632                         }
4633
4634                         /* now go back and verify any auth chunk to be sure */
4635                         if (auth_skipped && (stcb != NULL)) {
4636                                 struct sctp_auth_chunk *auth;
4637
4638                                 auth = (struct sctp_auth_chunk *)
4639                                     sctp_m_getptr(m, auth_offset,
4640                                     auth_len, chunk_buf);
4641                                 got_auth = 1;
4642                                 auth_skipped = 0;
4643                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4644                                     auth_offset)) {
4645                                         /* auth HMAC failed so dump it */
4646                                         *offset = length;
4647                                         if (locked_tcb) {
4648                                                 SCTP_TCB_UNLOCK(locked_tcb);
4649                                         }
4650                                         return (NULL);
4651                                 } else {
4652                                         /* remaining chunks are HMAC checked */
4653                                         stcb->asoc.authenticated = 1;
4654                                 }
4655                         }
4656                 }
4657                 if (stcb == NULL) {
4658                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4659                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4660                             msg);
4661                         /* no association, so it's out of the blue... */
4662                         sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err,
4663                             mflowtype, mflowid, inp->fibnum,
4664                             vrf_id, port);
4665                         *offset = length;
4666                         if (locked_tcb) {
4667                                 SCTP_TCB_UNLOCK(locked_tcb);
4668                         }
4669                         return (NULL);
4670                 }
4671                 asoc = &stcb->asoc;
4672                 /* ABORT and SHUTDOWN can use either v_tag... */
4673                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4674                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4675                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4676                         /* Take the T-bit always into account. */
4677                         if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
4678                             (vtag_in == asoc->my_vtag)) ||
4679                             (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
4680                             (vtag_in == asoc->peer_vtag))) {
4681                                 /* this is valid */
4682                         } else {
4683                                 /* drop this packet... */
4684                                 SCTP_STAT_INCR(sctps_badvtag);
4685                                 if (locked_tcb) {
4686                                         SCTP_TCB_UNLOCK(locked_tcb);
4687                                 }
4688                                 return (NULL);
4689                         }
4690                 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
4691                         if (vtag_in != asoc->my_vtag) {
4692                                 /*
4693                                  * this could be a stale SHUTDOWN-ACK or the
4694                                  * peer never got the SHUTDOWN-COMPLETE and
4695                                  * is still hung; we have started a new asoc
4696                                  * but it won't complete until the shutdown
4697                                  * is completed
4698                                  */
4699                                 if (locked_tcb) {
4700                                         SCTP_TCB_UNLOCK(locked_tcb);
4701                                 }
4702                                 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4703                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4704                                     msg);
4705                                 sctp_handle_ootb(m, iphlen, *offset, src, dst,
4706                                     sh, inp, op_err,
4707                                     mflowtype, mflowid, fibnum,
4708                                     vrf_id, port);
4709                                 return (NULL);
4710                         }
4711                 } else {
4712                         /* for all other chunks, vtag must match */
4713                         if (vtag_in != asoc->my_vtag) {
4714                                 /* invalid vtag... */
4715                                 SCTPDBG(SCTP_DEBUG_INPUT3,
4716                                     "invalid vtag: %xh, expect %xh\n",
4717                                     vtag_in, asoc->my_vtag);
4718                                 SCTP_STAT_INCR(sctps_badvtag);
4719                                 if (locked_tcb) {
4720                                         SCTP_TCB_UNLOCK(locked_tcb);
4721                                 }
4722                                 *offset = length;
4723                                 return (NULL);
4724                         }
4725                 }
4726         }                       /* end if !SCTP_COOKIE_ECHO */
4727         /*
4728          * process all control chunks...
4729          */
4730         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4731             (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4732             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4733             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
4734                 /* implied cookie-ack.. we must have lost the ack */
4735                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4736                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4737                             stcb->asoc.overall_error_count,
4738                             0,
4739                             SCTP_FROM_SCTP_INPUT,
4740                             __LINE__);
4741                 }
4742                 stcb->asoc.overall_error_count = 0;
4743                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4744                     *netp);
4745         }
4746 process_control_chunks:
4747         while (IS_SCTP_CONTROL(ch)) {
4748                 /* validate chunk length */
4749                 chk_length = ntohs(ch->chunk_length);
4750                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4751                     ch->chunk_type, chk_length);
4752                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4753                 if (chk_length < sizeof(*ch) ||
4754                     (*offset + (int)chk_length) > length) {
4755                         *offset = length;
4756                         if (locked_tcb) {
4757                                 SCTP_TCB_UNLOCK(locked_tcb);
4758                         }
4759                         return (NULL);
4760                 }
4761                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4762                 /*
4763                  * INIT-ACK only gets the init ack "header" portion only
4764                  * because we don't have to process the peer's COOKIE. All
4765                  * others get a complete chunk.
4766                  */
4767                 if ((ch->chunk_type == SCTP_INITIATION_ACK) ||
4768                     (ch->chunk_type == SCTP_INITIATION)) {
4769                         /* get an init-ack chunk */
4770                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4771                             sizeof(struct sctp_init_ack_chunk), chunk_buf);
4772                         if (ch == NULL) {
4773                                 *offset = length;
4774                                 if (locked_tcb) {
4775                                         SCTP_TCB_UNLOCK(locked_tcb);
4776                                 }
4777                                 return (NULL);
4778                         }
4779                 } else {
4780                         /* For cookies and all other chunks. */
4781                         if (chk_length > sizeof(chunk_buf)) {
4782                                 /*
4783                                  * use just the size of the chunk buffer so
4784                                  * the front part of our chunks fit in
4785                                  * contiguous space up to the chunk buffer
4786                                  * size (508 bytes). For chunks that need to
4787                                  * get more than that they must use the
4788                                  * sctp_m_getptr() function or other means
4789                                  * (e.g. know how to parse mbuf chains).
4790                                  * Cookies do this already.
4791                                  */
4792                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4793                                     (sizeof(chunk_buf) - 4),
4794                                     chunk_buf);
4795                                 if (ch == NULL) {
4796                                         *offset = length;
4797                                         if (locked_tcb) {
4798                                                 SCTP_TCB_UNLOCK(locked_tcb);
4799                                         }
4800                                         return (NULL);
4801                                 }
4802                         } else {
4803                                 /* We can fit it all */
4804                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4805                                     chk_length, chunk_buf);
4806                                 if (ch == NULL) {
4807                                         SCTP_PRINTF("sctp_process_control: Can't get the all data....\n");
4808                                         *offset = length;
4809                                         if (locked_tcb) {
4810                                                 SCTP_TCB_UNLOCK(locked_tcb);
4811                                         }
4812                                         return (NULL);
4813                                 }
4814                         }
4815                 }
4816                 num_chunks++;
4817                 /* Save off the last place we got a control from */
4818                 if (stcb != NULL) {
4819                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4820                                 /*
4821                                  * allow last_control to be NULL if
4822                                  * ASCONF... ASCONF processing will find the
4823                                  * right net later
4824                                  */
4825                                 if ((netp != NULL) && (*netp != NULL))
4826                                         stcb->asoc.last_control_chunk_from = *netp;
4827                         }
4828                 }
4829 #ifdef SCTP_AUDITING_ENABLED
4830                 sctp_audit_log(0xB0, ch->chunk_type);
4831 #endif
4832
4833                 /* check to see if this chunk required auth, but isn't */
4834                 if ((stcb != NULL) &&
4835                     (stcb->asoc.auth_supported == 1) &&
4836                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4837                     !stcb->asoc.authenticated) {
4838                         /* "silently" ignore */
4839                         SCTP_STAT_INCR(sctps_recvauthmissing);
4840                         goto next_chunk;
4841                 }
4842                 switch (ch->chunk_type) {
4843                 case SCTP_INITIATION:
4844                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4845                         /* The INIT chunk must be the only chunk. */
4846                         if ((num_chunks > 1) ||
4847                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4848                                 /* RFC 4960 requires that no ABORT is sent */
4849                                 *offset = length;
4850                                 if (locked_tcb) {
4851                                         SCTP_TCB_UNLOCK(locked_tcb);
4852                                 }
4853                                 return (NULL);
4854                         }
4855                         /* Honor our resource limit. */
4856                         if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
4857                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4858                                 sctp_abort_association(inp, stcb, m, iphlen,
4859                                     src, dst, sh, op_err,
4860                                     mflowtype, mflowid,
4861                                     vrf_id, port);
4862                                 *offset = length;
4863                                 return (NULL);
4864                         }
4865                         sctp_handle_init(m, iphlen, *offset, src, dst, sh,
4866                             (struct sctp_init_chunk *)ch, inp,
4867                             stcb, *netp, &abort_no_unlock,
4868                             mflowtype, mflowid,
4869                             vrf_id, port);
4870                         *offset = length;
4871                         if ((!abort_no_unlock) && (locked_tcb)) {
4872                                 SCTP_TCB_UNLOCK(locked_tcb);
4873                         }
4874                         return (NULL);
4875                         break;
4876                 case SCTP_PAD_CHUNK:
4877                         break;
4878                 case SCTP_INITIATION_ACK:
4879                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n");
4880                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4881                                 /* We are not interested anymore */
4882                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4883                                         ;
4884                                 } else {
4885                                         if ((locked_tcb != NULL) && (locked_tcb != stcb)) {
4886                                                 /* Very unlikely */
4887                                                 SCTP_TCB_UNLOCK(locked_tcb);
4888                                         }
4889                                         *offset = length;
4890                                         if (stcb) {
4891 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4892                                                 so = SCTP_INP_SO(inp);
4893                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4894                                                 SCTP_TCB_UNLOCK(stcb);
4895                                                 SCTP_SOCKET_LOCK(so, 1);
4896                                                 SCTP_TCB_LOCK(stcb);
4897                                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4898 #endif
4899                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
4900                                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
4901 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4902                                                 SCTP_SOCKET_UNLOCK(so, 1);
4903 #endif
4904                                         }
4905                                         return (NULL);
4906                                 }
4907                         }
4908                         /* The INIT-ACK chunk must be the only chunk. */
4909                         if ((num_chunks > 1) ||
4910                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4911                                 *offset = length;
4912                                 if (locked_tcb) {
4913                                         SCTP_TCB_UNLOCK(locked_tcb);
4914                                 }
4915                                 return (NULL);
4916                         }
4917                         if ((netp) && (*netp)) {
4918                                 ret = sctp_handle_init_ack(m, iphlen, *offset,
4919                                     src, dst, sh,
4920                                     (struct sctp_init_ack_chunk *)ch,
4921                                     stcb, *netp,
4922                                     &abort_no_unlock,
4923                                     mflowtype, mflowid,
4924                                     vrf_id);
4925                         } else {
4926                                 ret = -1;
4927                         }
4928                         *offset = length;
4929                         if (abort_no_unlock) {
4930                                 return (NULL);
4931                         }
4932                         /*
4933                          * Special case, I must call the output routine to
4934                          * get the cookie echoed
4935                          */
4936                         if ((stcb != NULL) && (ret == 0)) {
4937                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4938                         }
4939                         if (locked_tcb) {
4940                                 SCTP_TCB_UNLOCK(locked_tcb);
4941                         }
4942                         return (NULL);
4943                         break;
4944                 case SCTP_SELECTIVE_ACK:
4945                         {
4946                                 struct sctp_sack_chunk *sack;
4947                                 int abort_now = 0;
4948                                 uint32_t a_rwnd, cum_ack;
4949                                 uint16_t num_seg, num_dup;
4950                                 uint8_t flags;
4951                                 int offset_seg, offset_dup;
4952
4953                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n");
4954                                 SCTP_STAT_INCR(sctps_recvsacks);
4955                                 if (stcb == NULL) {
4956                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n");
4957                                         break;
4958                                 }
4959                                 if (chk_length < sizeof(struct sctp_sack_chunk)) {
4960                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4961                                         break;
4962                                 }
4963                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4964                                         /*-
4965                                          * If we have sent a shutdown-ack, we will pay no
4966                                          * attention to a sack sent in to us since
4967                                          * we don't care anymore.
4968                                          */
4969                                         break;
4970                                 }
4971                                 sack = (struct sctp_sack_chunk *)ch;
4972                                 flags = ch->chunk_flags;
4973                                 cum_ack = ntohl(sack->sack.cum_tsn_ack);
4974                                 num_seg = ntohs(sack->sack.num_gap_ack_blks);
4975                                 num_dup = ntohs(sack->sack.num_dup_tsns);
4976                                 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd);
4977                                 if (sizeof(struct sctp_sack_chunk) +
4978                                     num_seg * sizeof(struct sctp_gap_ack_block) +
4979                                     num_dup * sizeof(uint32_t) != chk_length) {
4980                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4981                                         break;
4982                                 }
4983                                 offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4984                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4985                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4986                                     cum_ack, num_seg, a_rwnd);
4987                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4988                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4989                                     (num_seg == 0) &&
4990                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4991                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4992                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4993                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))
4994                                     ) {
4995                                         /*
4996                                          * We have a SIMPLE sack having no
4997                                          * prior segments and data on sent
4998                                          * queue to be acked.. Use the
4999                                          * faster path sack processing. We
5000                                          * also allow window update sacks
5001                                          * with no missing segments to go
5002                                          * this way too.
5003                                          */
5004                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen);
5005                                 } else {
5006                                         if (netp && *netp)
5007                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
5008                                                     num_seg, 0, num_dup, &abort_now, flags,
5009                                                     cum_ack, a_rwnd, ecne_seen);
5010                                 }
5011                                 if (abort_now) {
5012                                         /* ABORT signal from sack processing */
5013                                         *offset = length;
5014                                         return (NULL);
5015                                 }
5016                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
5017                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
5018                                     (stcb->asoc.stream_queue_cnt == 0)) {
5019                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
5020                                 }
5021                         }
5022                         break;
5023                         /*
5024                          * EY - nr_sack:  If the received chunk is an
5025                          * nr_sack chunk
5026                          */
5027                 case SCTP_NR_SELECTIVE_ACK:
5028                         {
5029                                 struct sctp_nr_sack_chunk *nr_sack;
5030                                 int abort_now = 0;
5031                                 uint32_t a_rwnd, cum_ack;
5032                                 uint16_t num_seg, num_nr_seg, num_dup;
5033                                 uint8_t flags;
5034                                 int offset_seg, offset_dup;
5035
5036                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n");
5037                                 SCTP_STAT_INCR(sctps_recvsacks);
5038                                 if (stcb == NULL) {
5039                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n");
5040                                         break;
5041                                 }
5042                                 if (stcb->asoc.nrsack_supported == 0) {
5043                                         goto unknown_chunk;
5044                                 }
5045                                 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
5046                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n");
5047                                         break;
5048                                 }
5049                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
5050                                         /*-
5051                                          * If we have sent a shutdown-ack, we will pay no
5052                                          * attention to a sack sent in to us since
5053                                          * we don't care anymore.
5054                                          */
5055                                         break;
5056                                 }
5057                                 nr_sack = (struct sctp_nr_sack_chunk *)ch;
5058                                 flags = ch->chunk_flags;
5059                                 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
5060                                 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
5061                                 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
5062                                 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
5063                                 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd);
5064                                 if (sizeof(struct sctp_nr_sack_chunk) +
5065                                     (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
5066                                     num_dup * sizeof(uint32_t) != chk_length) {
5067                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
5068                                         break;
5069                                 }
5070                                 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
5071                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
5072                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
5073                                     cum_ack, num_seg, a_rwnd);
5074                                 stcb->asoc.seen_a_sack_this_pkt = 1;
5075                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
5076                                     (num_seg == 0) && (num_nr_seg == 0) &&
5077                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
5078                                     (stcb->asoc.saw_sack_with_frags == 0) &&
5079                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
5080                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
5081                                         /*
5082                                          * We have a SIMPLE sack having no
5083                                          * prior segments and data on sent
5084                                          * queue to be acked. Use the faster
5085                                          * path sack processing. We also
5086                                          * allow window update sacks with no
5087                                          * missing segments to go this way
5088                                          * too.
5089                                          */
5090                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
5091                                             &abort_now, ecne_seen);
5092                                 } else {
5093                                         if (netp && *netp)
5094                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
5095                                                     num_seg, num_nr_seg, num_dup, &abort_now, flags,
5096                                                     cum_ack, a_rwnd, ecne_seen);
5097                                 }
5098                                 if (abort_now) {
5099                                         /* ABORT signal from sack processing */
5100                                         *offset = length;
5101                                         return (NULL);
5102                                 }
5103                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
5104                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
5105                                     (stcb->asoc.stream_queue_cnt == 0)) {
5106                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
5107                                 }
5108                         }
5109                         break;
5110
5111                 case SCTP_HEARTBEAT_REQUEST:
5112                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
5113                         if ((stcb) && netp && *netp) {
5114                                 SCTP_STAT_INCR(sctps_recvheartbeat);
5115                                 sctp_send_heartbeat_ack(stcb, m, *offset,
5116                                     chk_length, *netp);
5117
5118                                 /* He's alive so give him credit */
5119                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5120                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5121                                             stcb->asoc.overall_error_count,
5122                                             0,
5123                                             SCTP_FROM_SCTP_INPUT,
5124                                             __LINE__);
5125                                 }
5126                                 stcb->asoc.overall_error_count = 0;
5127                         }
5128                         break;
5129                 case SCTP_HEARTBEAT_ACK:
5130                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n");
5131                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
5132                                 /* Its not ours */
5133                                 *offset = length;
5134                                 if (locked_tcb) {
5135                                         SCTP_TCB_UNLOCK(locked_tcb);
5136                                 }
5137                                 return (NULL);
5138                         }
5139                         /* He's alive so give him credit */
5140                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5141                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5142                                     stcb->asoc.overall_error_count,
5143                                     0,
5144                                     SCTP_FROM_SCTP_INPUT,
5145                                     __LINE__);
5146                         }
5147                         stcb->asoc.overall_error_count = 0;
5148                         SCTP_STAT_INCR(sctps_recvheartbeatack);
5149                         if (netp && *netp)
5150                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
5151                                     stcb, *netp);
5152                         break;
5153                 case SCTP_ABORT_ASSOCIATION:
5154                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
5155                             (void *)stcb);
5156                         if ((stcb) && netp && *netp)
5157                                 sctp_handle_abort((struct sctp_abort_chunk *)ch,
5158                                     stcb, *netp);
5159                         *offset = length;
5160                         return (NULL);
5161                         break;
5162                 case SCTP_SHUTDOWN:
5163                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
5164                             (void *)stcb);
5165                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
5166                                 *offset = length;
5167                                 if (locked_tcb) {
5168                                         SCTP_TCB_UNLOCK(locked_tcb);
5169                                 }
5170                                 return (NULL);
5171                         }
5172                         if (netp && *netp) {
5173                                 int abort_flag = 0;
5174
5175                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
5176                                     stcb, *netp, &abort_flag);
5177                                 if (abort_flag) {
5178                                         *offset = length;
5179                                         return (NULL);
5180                                 }
5181                         }
5182                         break;
5183                 case SCTP_SHUTDOWN_ACK:
5184                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb);
5185                         if ((stcb) && (netp) && (*netp))
5186                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
5187                         *offset = length;
5188                         return (NULL);
5189                         break;
5190
5191                 case SCTP_OPERATION_ERROR:
5192                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n");
5193                         if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) {
5194                                 *offset = length;
5195                                 return (NULL);
5196                         }
5197                         break;
5198                 case SCTP_COOKIE_ECHO:
5199                         SCTPDBG(SCTP_DEBUG_INPUT3,
5200                             "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb);
5201                         if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5202                                 ;
5203                         } else {
5204                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5205                                         /* We are not interested anymore */
5206                         abend:
5207                                         if (stcb) {
5208                                                 SCTP_TCB_UNLOCK(stcb);
5209                                         }
5210                                         *offset = length;
5211                                         return (NULL);
5212                                 }
5213                         }
5214                         /*
5215                          * First are we accepting? We do this again here
5216                          * since it is possible that a previous endpoint WAS
5217                          * listening responded to a INIT-ACK and then
5218                          * closed. We opened and bound.. and are now no
5219                          * longer listening.
5220                          */
5221
5222                         if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) {
5223                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
5224                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
5225                                         op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
5226                                         sctp_abort_association(inp, stcb, m, iphlen,
5227                                             src, dst, sh, op_err,
5228                                             mflowtype, mflowid,
5229                                             vrf_id, port);
5230                                 }
5231                                 *offset = length;
5232                                 return (NULL);
5233                         } else {
5234                                 struct mbuf *ret_buf;
5235                                 struct sctp_inpcb *linp;
5236
5237                                 if (stcb) {
5238                                         linp = NULL;
5239                                 } else {
5240                                         linp = inp;
5241                                 }
5242
5243                                 if (linp) {
5244                                         SCTP_ASOC_CREATE_LOCK(linp);
5245                                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
5246                                             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
5247                                                 SCTP_ASOC_CREATE_UNLOCK(linp);
5248                                                 goto abend;
5249                                         }
5250                                 }
5251                                 if (netp) {
5252                                         ret_buf =
5253                                             sctp_handle_cookie_echo(m, iphlen,
5254                                             *offset,
5255                                             src, dst,
5256                                             sh,
5257                                             (struct sctp_cookie_echo_chunk *)ch,
5258                                             &inp, &stcb, netp,
5259                                             auth_skipped,
5260                                             auth_offset,
5261                                             auth_len,
5262                                             &locked_tcb,
5263                                             mflowtype,
5264                                             mflowid,
5265                                             vrf_id,
5266                                             port);
5267                                 } else {
5268                                         ret_buf = NULL;
5269                                 }
5270                                 if (linp) {
5271                                         SCTP_ASOC_CREATE_UNLOCK(linp);
5272                                 }
5273                                 if (ret_buf == NULL) {
5274                                         if (locked_tcb) {
5275                                                 SCTP_TCB_UNLOCK(locked_tcb);
5276                                         }
5277                                         SCTPDBG(SCTP_DEBUG_INPUT3,
5278                                             "GAK, null buffer\n");
5279                                         *offset = length;
5280                                         return (NULL);
5281                                 }
5282                                 /* if AUTH skipped, see if it verified... */
5283                                 if (auth_skipped) {
5284                                         got_auth = 1;
5285                                         auth_skipped = 0;
5286                                 }
5287                                 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
5288                                         /*
5289                                          * Restart the timer if we have
5290                                          * pending data
5291                                          */
5292                                         struct sctp_tmit_chunk *chk;
5293
5294                                         chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
5295                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
5296                                 }
5297                         }
5298                         break;
5299                 case SCTP_COOKIE_ACK:
5300                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb);
5301                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
5302                                 if (locked_tcb) {
5303                                         SCTP_TCB_UNLOCK(locked_tcb);
5304                                 }
5305                                 return (NULL);
5306                         }
5307                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5308                                 /* We are not interested anymore */
5309                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5310                                         ;
5311                                 } else if (stcb) {
5312 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5313                                         so = SCTP_INP_SO(inp);
5314                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5315                                         SCTP_TCB_UNLOCK(stcb);
5316                                         SCTP_SOCKET_LOCK(so, 1);
5317                                         SCTP_TCB_LOCK(stcb);
5318                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5319 #endif
5320                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5321                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
5322 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5323                                         SCTP_SOCKET_UNLOCK(so, 1);
5324 #endif
5325                                         *offset = length;
5326                                         return (NULL);
5327                                 }
5328                         }
5329                         /* He's alive so give him credit */
5330                         if ((stcb) && netp && *netp) {
5331                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5332                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5333                                             stcb->asoc.overall_error_count,
5334                                             0,
5335                                             SCTP_FROM_SCTP_INPUT,
5336                                             __LINE__);
5337                                 }
5338                                 stcb->asoc.overall_error_count = 0;
5339                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
5340                         }
5341                         break;
5342                 case SCTP_ECN_ECHO:
5343                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n");
5344                         /* He's alive so give him credit */
5345                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
5346                                 /* Its not ours */
5347                                 if (locked_tcb) {
5348                                         SCTP_TCB_UNLOCK(locked_tcb);
5349                                 }
5350                                 *offset = length;
5351                                 return (NULL);
5352                         }
5353                         if (stcb) {
5354                                 if (stcb->asoc.ecn_supported == 0) {
5355                                         goto unknown_chunk;
5356                                 }
5357                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5358                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5359                                             stcb->asoc.overall_error_count,
5360                                             0,
5361                                             SCTP_FROM_SCTP_INPUT,
5362                                             __LINE__);
5363                                 }
5364                                 stcb->asoc.overall_error_count = 0;
5365                                 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch,
5366                                     stcb);
5367                                 ecne_seen = 1;
5368                         }
5369                         break;
5370                 case SCTP_ECN_CWR:
5371                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n");
5372                         /* He's alive so give him credit */
5373                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
5374                                 /* Its not ours */
5375                                 if (locked_tcb) {
5376                                         SCTP_TCB_UNLOCK(locked_tcb);
5377                                 }
5378                                 *offset = length;
5379                                 return (NULL);
5380                         }
5381                         if (stcb) {
5382                                 if (stcb->asoc.ecn_supported == 0) {
5383                                         goto unknown_chunk;
5384                                 }
5385                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5386                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5387                                             stcb->asoc.overall_error_count,
5388                                             0,
5389                                             SCTP_FROM_SCTP_INPUT,
5390                                             __LINE__);
5391                                 }
5392                                 stcb->asoc.overall_error_count = 0;
5393                                 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5394                         }
5395                         break;
5396                 case SCTP_SHUTDOWN_COMPLETE:
5397                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb);
5398                         /* must be first and only chunk */
5399                         if ((num_chunks > 1) ||
5400                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5401                                 *offset = length;
5402                                 if (locked_tcb) {
5403                                         SCTP_TCB_UNLOCK(locked_tcb);
5404                                 }
5405                                 return (NULL);
5406                         }
5407                         if ((stcb) && netp && *netp) {
5408                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5409                                     stcb, *netp);
5410                         }
5411                         *offset = length;
5412                         return (NULL);
5413                         break;
5414                 case SCTP_ASCONF:
5415                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5416                         /* He's alive so give him credit */
5417                         if (stcb) {
5418                                 if (stcb->asoc.asconf_supported == 0) {
5419                                         goto unknown_chunk;
5420                                 }
5421                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5422                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5423                                             stcb->asoc.overall_error_count,
5424                                             0,
5425                                             SCTP_FROM_SCTP_INPUT,
5426                                             __LINE__);
5427                                 }
5428                                 stcb->asoc.overall_error_count = 0;
5429                                 sctp_handle_asconf(m, *offset, src,
5430                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5431                                 asconf_cnt++;
5432                         }
5433                         break;
5434                 case SCTP_ASCONF_ACK:
5435                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n");
5436                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5437                                 /* Its not ours */
5438                                 if (locked_tcb) {
5439                                         SCTP_TCB_UNLOCK(locked_tcb);
5440                                 }
5441                                 *offset = length;
5442                                 return (NULL);
5443                         }
5444                         if ((stcb) && netp && *netp) {
5445                                 if (stcb->asoc.asconf_supported == 0) {
5446                                         goto unknown_chunk;
5447                                 }
5448                                 /* He's alive so give him credit */
5449                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5450                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5451                                             stcb->asoc.overall_error_count,
5452                                             0,
5453                                             SCTP_FROM_SCTP_INPUT,
5454                                             __LINE__);
5455                                 }
5456                                 stcb->asoc.overall_error_count = 0;
5457                                 sctp_handle_asconf_ack(m, *offset,
5458                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5459                                 if (abort_no_unlock)
5460                                         return (NULL);
5461                         }
5462                         break;
5463                 case SCTP_FORWARD_CUM_TSN:
5464                 case SCTP_IFORWARD_CUM_TSN:
5465                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n");
5466                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5467                                 /* Its not ours */
5468                                 if (locked_tcb) {
5469                                         SCTP_TCB_UNLOCK(locked_tcb);
5470                                 }
5471                                 *offset = length;
5472                                 return (NULL);
5473                         }
5474                         /* He's alive so give him credit */
5475                         if (stcb) {
5476                                 int abort_flag = 0;
5477
5478                                 if (stcb->asoc.prsctp_supported == 0) {
5479                                         goto unknown_chunk;
5480                                 }
5481                                 stcb->asoc.overall_error_count = 0;
5482                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5483                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5484                                             stcb->asoc.overall_error_count,
5485                                             0,
5486                                             SCTP_FROM_SCTP_INPUT,
5487                                             __LINE__);
5488                                 }
5489                                 *fwd_tsn_seen = 1;
5490                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5491                                         /* We are not interested anymore */
5492 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5493                                         so = SCTP_INP_SO(inp);
5494                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5495                                         SCTP_TCB_UNLOCK(stcb);
5496                                         SCTP_SOCKET_LOCK(so, 1);
5497                                         SCTP_TCB_LOCK(stcb);
5498                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5499 #endif
5500                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5501                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_31);
5502 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5503                                         SCTP_SOCKET_UNLOCK(so, 1);
5504 #endif
5505                                         *offset = length;
5506                                         return (NULL);
5507                                 }
5508                                 sctp_handle_forward_tsn(stcb,
5509                                     (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5510                                 if (abort_flag) {
5511                                         *offset = length;
5512                                         return (NULL);
5513                                 } else {
5514                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5515                                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5516                                                     stcb->asoc.overall_error_count,
5517                                                     0,
5518                                                     SCTP_FROM_SCTP_INPUT,
5519                                                     __LINE__);
5520                                         }
5521                                         stcb->asoc.overall_error_count = 0;
5522                                 }
5523
5524                         }
5525                         break;
5526                 case SCTP_STREAM_RESET:
5527                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5528                         if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) {
5529                                 /* Its not ours */
5530                                 if (locked_tcb) {
5531                                         SCTP_TCB_UNLOCK(locked_tcb);
5532                                 }
5533                                 *offset = length;
5534                                 return (NULL);
5535                         }
5536                         if (stcb->asoc.reconfig_supported == 0) {
5537                                 goto unknown_chunk;
5538                         }
5539                         if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
5540                                 /* stop processing */
5541                                 *offset = length;
5542                                 return (NULL);
5543                         }
5544                         break;
5545                 case SCTP_PACKET_DROPPED:
5546                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5547                         /* re-get it all please */
5548                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5549                                 /* Its not ours */
5550                                 if (locked_tcb) {
5551                                         SCTP_TCB_UNLOCK(locked_tcb);
5552                                 }
5553                                 *offset = length;
5554                                 return (NULL);
5555                         }
5556                         if (ch && (stcb) && netp && (*netp)) {
5557                                 if (stcb->asoc.pktdrop_supported == 0) {
5558                                         goto unknown_chunk;
5559                                 }
5560                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5561                                     stcb, *netp,
5562                                     min(chk_length, (sizeof(chunk_buf) - 4)));
5563
5564                         }
5565                         break;
5566                 case SCTP_AUTHENTICATION:
5567                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5568                         if (stcb == NULL) {
5569                                 /* save the first AUTH for later processing */
5570                                 if (auth_skipped == 0) {
5571                                         auth_offset = *offset;
5572                                         auth_len = chk_length;
5573                                         auth_skipped = 1;
5574                                 }
5575                                 /* skip this chunk (temporarily) */
5576                                 goto next_chunk;
5577                         }
5578                         if (stcb->asoc.auth_supported == 0) {
5579                                 goto unknown_chunk;
5580                         }
5581                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5582                             (chk_length > (sizeof(struct sctp_auth_chunk) +
5583                             SCTP_AUTH_DIGEST_LEN_MAX))) {
5584                                 /* Its not ours */
5585                                 if (locked_tcb) {
5586                                         SCTP_TCB_UNLOCK(locked_tcb);
5587                                 }
5588                                 *offset = length;
5589                                 return (NULL);
5590                         }
5591                         if (got_auth == 1) {
5592                                 /* skip this chunk... it's already auth'd */
5593                                 goto next_chunk;
5594                         }
5595                         got_auth = 1;
5596                         if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
5597                             m, *offset)) {
5598                                 /* auth HMAC failed so dump the packet */
5599                                 *offset = length;
5600                                 return (stcb);
5601                         } else {
5602                                 /* remaining chunks are HMAC checked */
5603                                 stcb->asoc.authenticated = 1;
5604                         }
5605                         break;
5606
5607                 default:
5608         unknown_chunk:
5609                         /* it's an unknown chunk! */
5610                         if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
5611                                 struct sctp_gen_error_cause *cause;
5612                                 int len;
5613
5614                                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause),
5615                                     0, M_NOWAIT, 1, MT_DATA);
5616                                 if (op_err != NULL) {
5617                                         len = min(SCTP_SIZE32(chk_length), (uint32_t) (length - *offset));
5618                                         cause = mtod(op_err, struct sctp_gen_error_cause *);
5619                                         cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5620                                         cause->length = htons((uint16_t) (len + sizeof(struct sctp_gen_error_cause)));
5621                                         SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
5622                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT);
5623                                         if (SCTP_BUF_NEXT(op_err) != NULL) {
5624 #ifdef SCTP_MBUF_LOGGING
5625                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5626                                                         sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY);
5627                                                 }
5628 #endif
5629                                                 sctp_queue_op_err(stcb, op_err);
5630                                         } else {
5631                                                 sctp_m_freem(op_err);
5632                                         }
5633                                 }
5634                         }
5635                         if ((ch->chunk_type & 0x80) == 0) {
5636                                 /* discard this packet */
5637                                 *offset = length;
5638                                 return (stcb);
5639                         }       /* else skip this bad chunk and continue... */
5640                         break;
5641                 }               /* switch (ch->chunk_type) */
5642
5643
5644 next_chunk:
5645                 /* get the next chunk */
5646                 *offset += SCTP_SIZE32(chk_length);
5647                 if (*offset >= length) {
5648                         /* no more data left in the mbuf chain */
5649                         break;
5650                 }
5651                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5652                     sizeof(struct sctp_chunkhdr), chunk_buf);
5653                 if (ch == NULL) {
5654                         if (locked_tcb) {
5655                                 SCTP_TCB_UNLOCK(locked_tcb);
5656                         }
5657                         *offset = length;
5658                         return (NULL);
5659                 }
5660         }                       /* while */
5661
5662         if (asconf_cnt > 0 && stcb != NULL) {
5663                 sctp_send_asconf_ack(stcb);
5664         }
5665         return (stcb);
5666 }
5667
5668
5669 /*
5670  * common input chunk processing (v4 and v6)
5671  */
5672 void
5673 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
5674     struct sockaddr *src, struct sockaddr *dst,
5675     struct sctphdr *sh, struct sctp_chunkhdr *ch,
5676 #if !defined(SCTP_WITH_NO_CSUM)
5677     uint8_t compute_crc,
5678 #endif
5679     uint8_t ecn_bits,
5680     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
5681     uint32_t vrf_id, uint16_t port)
5682 {
5683         uint32_t high_tsn;
5684         int fwd_tsn_seen = 0, data_processed = 0;
5685         struct mbuf *m = *mm, *op_err;
5686         char msg[SCTP_DIAG_INFO_LEN];
5687         int un_sent;
5688         int cnt_ctrl_ready = 0;
5689         struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
5690         struct sctp_tcb *stcb = NULL;
5691         struct sctp_nets *net = NULL;
5692
5693         SCTP_STAT_INCR(sctps_recvdatagrams);
5694 #ifdef SCTP_AUDITING_ENABLED
5695         sctp_audit_log(0xE0, 1);
5696         sctp_auditing(0, inp, stcb, net);
5697 #endif
5698 #if !defined(SCTP_WITH_NO_CSUM)
5699         if (compute_crc != 0) {
5700                 uint32_t check, calc_check;
5701
5702                 check = sh->checksum;
5703                 sh->checksum = 0;
5704                 calc_check = sctp_calculate_cksum(m, iphlen);
5705                 sh->checksum = check;
5706                 if (calc_check != check) {
5707                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5708                             calc_check, check, (void *)m, length, iphlen);
5709                         stcb = sctp_findassociation_addr(m, offset, src, dst,
5710                             sh, ch, &inp, &net, vrf_id);
5711 #if defined(INET) || defined(INET6)
5712                         if ((ch->chunk_type != SCTP_INITIATION) &&
5713                             (net != NULL) && (net->port != port)) {
5714                                 if (net->port == 0) {
5715                                         /* UDP encapsulation turned on. */
5716                                         net->mtu -= sizeof(struct udphdr);
5717                                         if (stcb->asoc.smallest_mtu > net->mtu) {
5718                                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5719                                         }
5720                                 } else if (port == 0) {
5721                                         /* UDP encapsulation turned off. */
5722                                         net->mtu += sizeof(struct udphdr);
5723                                         /* XXX Update smallest_mtu */
5724                                 }
5725                                 net->port = port;
5726                         }
5727 #endif
5728                         if (net != NULL) {
5729                                 net->flowtype = mflowtype;
5730                                 net->flowid = mflowid;
5731                         }
5732                         if ((inp != NULL) && (stcb != NULL)) {
5733                                 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
5734                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5735                         } else if ((inp != NULL) && (stcb == NULL)) {
5736                                 inp_decr = inp;
5737                         }
5738                         SCTP_STAT_INCR(sctps_badsum);
5739                         SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5740                         goto out;
5741                 }
5742         }
5743 #endif
5744         /* Destination port of 0 is illegal, based on RFC4960. */
5745         if (sh->dest_port == 0) {
5746                 SCTP_STAT_INCR(sctps_hdrops);
5747                 goto out;
5748         }
5749         stcb = sctp_findassociation_addr(m, offset, src, dst,
5750             sh, ch, &inp, &net, vrf_id);
5751 #if defined(INET) || defined(INET6)
5752         if ((ch->chunk_type != SCTP_INITIATION) &&
5753             (net != NULL) && (net->port != port)) {
5754                 if (net->port == 0) {
5755                         /* UDP encapsulation turned on. */
5756                         net->mtu -= sizeof(struct udphdr);
5757                         if (stcb->asoc.smallest_mtu > net->mtu) {
5758                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5759                         }
5760                 } else if (port == 0) {
5761                         /* UDP encapsulation turned off. */
5762                         net->mtu += sizeof(struct udphdr);
5763                         /* XXX Update smallest_mtu */
5764                 }
5765                 net->port = port;
5766         }
5767 #endif
5768         if (net != NULL) {
5769                 net->flowtype = mflowtype;
5770                 net->flowid = mflowid;
5771         }
5772         if (inp == NULL) {
5773                 SCTP_STAT_INCR(sctps_noport);
5774                 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
5775                         goto out;
5776                 }
5777                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5778                         sctp_send_shutdown_complete2(src, dst, sh,
5779                             mflowtype, mflowid, fibnum,
5780                             vrf_id, port);
5781                         goto out;
5782                 }
5783                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5784                         goto out;
5785                 }
5786                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
5787                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
5788                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
5789                             (ch->chunk_type != SCTP_INIT))) {
5790                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5791                                     "Out of the blue");
5792                                 sctp_send_abort(m, iphlen, src, dst,
5793                                     sh, 0, op_err,
5794                                     mflowtype, mflowid, fibnum,
5795                                     vrf_id, port);
5796                         }
5797                 }
5798                 goto out;
5799         } else if (stcb == NULL) {
5800                 inp_decr = inp;
5801         }
5802 #ifdef IPSEC
5803         /*-
5804          * I very much doubt any of the IPSEC stuff will work but I have no
5805          * idea, so I will leave it in place.
5806          */
5807         if (inp != NULL) {
5808                 switch (dst->sa_family) {
5809 #ifdef INET
5810                 case AF_INET:
5811                         if (ipsec4_in_reject(m, &inp->ip_inp.inp)) {
5812                                 SCTP_STAT_INCR(sctps_hdrops);
5813                                 goto out;
5814                         }
5815                         break;
5816 #endif
5817 #ifdef INET6
5818                 case AF_INET6:
5819                         if (ipsec6_in_reject(m, &inp->ip_inp.inp)) {
5820                                 SCTP_STAT_INCR(sctps_hdrops);
5821                                 goto out;
5822                         }
5823                         break;
5824 #endif
5825                 default:
5826                         break;
5827                 }
5828         }
5829 #endif
5830         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5831             (void *)m, iphlen, offset, length, (void *)stcb);
5832         if (stcb) {
5833                 /* always clear this before beginning a packet */
5834                 stcb->asoc.authenticated = 0;
5835                 stcb->asoc.seen_a_sack_this_pkt = 0;
5836                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5837                     (void *)stcb, stcb->asoc.state);
5838
5839                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5840                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5841                         /*-
5842                          * If we hit here, we had a ref count
5843                          * up when the assoc was aborted and the
5844                          * timer is clearing out the assoc, we should
5845                          * NOT respond to any packet.. its OOTB.
5846                          */
5847                         SCTP_TCB_UNLOCK(stcb);
5848                         stcb = NULL;
5849                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5850                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5851                             msg);
5852                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5853                             mflowtype, mflowid, inp->fibnum,
5854                             vrf_id, port);
5855                         goto out;
5856                 }
5857         }
5858         if (IS_SCTP_CONTROL(ch)) {
5859                 /* process the control portion of the SCTP packet */
5860                 /* sa_ignore NO_NULL_CHK */
5861                 stcb = sctp_process_control(m, iphlen, &offset, length,
5862                     src, dst, sh, ch,
5863                     inp, stcb, &net, &fwd_tsn_seen,
5864                     mflowtype, mflowid, fibnum,
5865                     vrf_id, port);
5866                 if (stcb) {
5867                         /*
5868                          * This covers us if the cookie-echo was there and
5869                          * it changes our INP.
5870                          */
5871                         inp = stcb->sctp_ep;
5872 #if defined(INET) || defined(INET6)
5873                         if ((ch->chunk_type != SCTP_INITIATION) &&
5874                             (net != NULL) && (net->port != port)) {
5875                                 if (net->port == 0) {
5876                                         /* UDP encapsulation turned on. */
5877                                         net->mtu -= sizeof(struct udphdr);
5878                                         if (stcb->asoc.smallest_mtu > net->mtu) {
5879                                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5880                                         }
5881                                 } else if (port == 0) {
5882                                         /* UDP encapsulation turned off. */
5883                                         net->mtu += sizeof(struct udphdr);
5884                                         /* XXX Update smallest_mtu */
5885                                 }
5886                                 net->port = port;
5887                         }
5888 #endif
5889                 }
5890         } else {
5891                 /*
5892                  * no control chunks, so pre-process DATA chunks (these
5893                  * checks are taken care of by control processing)
5894                  */
5895
5896                 /*
5897                  * if DATA only packet, and auth is required, then punt...
5898                  * can't have authenticated without any AUTH (control)
5899                  * chunks
5900                  */
5901                 if ((stcb != NULL) &&
5902                     (stcb->asoc.auth_supported == 1) &&
5903                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5904                         /* "silently" ignore */
5905                         SCTP_STAT_INCR(sctps_recvauthmissing);
5906                         goto out;
5907                 }
5908                 if (stcb == NULL) {
5909                         /* out of the blue DATA chunk */
5910                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5911                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5912                             msg);
5913                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5914                             mflowtype, mflowid, fibnum,
5915                             vrf_id, port);
5916                         goto out;
5917                 }
5918                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5919                         /* v_tag mismatch! */
5920                         SCTP_STAT_INCR(sctps_badvtag);
5921                         goto out;
5922                 }
5923         }
5924
5925         if (stcb == NULL) {
5926                 /*
5927                  * no valid TCB for this packet, or we found it's a bad
5928                  * packet while processing control, or we're done with this
5929                  * packet (done or skip rest of data), so we drop it...
5930                  */
5931                 goto out;
5932         }
5933         /*
5934          * DATA chunk processing
5935          */
5936         /* plow through the data chunks while length > offset */
5937
5938         /*
5939          * Rest should be DATA only.  Check authentication state if AUTH for
5940          * DATA is required.
5941          */
5942         if ((length > offset) &&
5943             (stcb != NULL) &&
5944             (stcb->asoc.auth_supported == 1) &&
5945             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5946             !stcb->asoc.authenticated) {
5947                 /* "silently" ignore */
5948                 SCTP_STAT_INCR(sctps_recvauthmissing);
5949                 SCTPDBG(SCTP_DEBUG_AUTH1,
5950                     "Data chunk requires AUTH, skipped\n");
5951                 goto trigger_send;
5952         }
5953         if (length > offset) {
5954                 int retval;
5955
5956                 /*
5957                  * First check to make sure our state is correct. We would
5958                  * not get here unless we really did have a tag, so we don't
5959                  * abort if this happens, just dump the chunk silently.
5960                  */
5961                 switch (SCTP_GET_STATE(&stcb->asoc)) {
5962                 case SCTP_STATE_COOKIE_ECHOED:
5963                         /*
5964                          * we consider data with valid tags in this state
5965                          * shows us the cookie-ack was lost. Imply it was
5966                          * there.
5967                          */
5968                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5969                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5970                                     stcb->asoc.overall_error_count,
5971                                     0,
5972                                     SCTP_FROM_SCTP_INPUT,
5973                                     __LINE__);
5974                         }
5975                         stcb->asoc.overall_error_count = 0;
5976                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5977                         break;
5978                 case SCTP_STATE_COOKIE_WAIT:
5979                         /*
5980                          * We consider OOTB any data sent during asoc setup.
5981                          */
5982                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5983                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5984                             msg);
5985                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5986                             mflowtype, mflowid, inp->fibnum,
5987                             vrf_id, port);
5988                         goto out;
5989                         /* sa_ignore NOTREACHED */
5990                         break;
5991                 case SCTP_STATE_EMPTY:  /* should not happen */
5992                 case SCTP_STATE_INUSE:  /* should not happen */
5993                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
5994                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5995                 default:
5996                         goto out;
5997                         /* sa_ignore NOTREACHED */
5998                         break;
5999                 case SCTP_STATE_OPEN:
6000                 case SCTP_STATE_SHUTDOWN_SENT:
6001                         break;
6002                 }
6003                 /* plow through the data chunks while length > offset */
6004                 retval = sctp_process_data(mm, iphlen, &offset, length,
6005                     inp, stcb, net, &high_tsn);
6006                 if (retval == 2) {
6007                         /*
6008                          * The association aborted, NO UNLOCK needed since
6009                          * the association is destroyed.
6010                          */
6011                         stcb = NULL;
6012                         goto out;
6013                 }
6014                 data_processed = 1;
6015                 /*
6016                  * Anything important needs to have been m_copy'ed in
6017                  * process_data
6018                  */
6019         }
6020         /* take care of ecn */
6021         if ((data_processed == 1) &&
6022             (stcb->asoc.ecn_supported == 1) &&
6023             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
6024                 /* Yep, we need to add a ECNE */
6025                 sctp_send_ecn_echo(stcb, net, high_tsn);
6026         }
6027         if ((data_processed == 0) && (fwd_tsn_seen)) {
6028                 int was_a_gap;
6029                 uint32_t highest_tsn;
6030
6031                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
6032                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
6033                 } else {
6034                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
6035                 }
6036                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
6037                 stcb->asoc.send_sack = 1;
6038                 sctp_sack_check(stcb, was_a_gap);
6039         } else if (fwd_tsn_seen) {
6040                 stcb->asoc.send_sack = 1;
6041         }
6042         /* trigger send of any chunks in queue... */
6043 trigger_send:
6044 #ifdef SCTP_AUDITING_ENABLED
6045         sctp_audit_log(0xE0, 2);
6046         sctp_auditing(1, inp, stcb, net);
6047 #endif
6048         SCTPDBG(SCTP_DEBUG_INPUT1,
6049             "Check for chunk output prw:%d tqe:%d tf=%d\n",
6050             stcb->asoc.peers_rwnd,
6051             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
6052             stcb->asoc.total_flight);
6053         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
6054         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
6055                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
6056         }
6057         if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) ||
6058             cnt_ctrl_ready ||
6059             stcb->asoc.trigger_reset ||
6060             ((un_sent) &&
6061             (stcb->asoc.peers_rwnd > 0 ||
6062             (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
6063                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
6064                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
6065                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
6066         }
6067 #ifdef SCTP_AUDITING_ENABLED
6068         sctp_audit_log(0xE0, 3);
6069         sctp_auditing(2, inp, stcb, net);
6070 #endif
6071 out:
6072         if (stcb != NULL) {
6073                 SCTP_TCB_UNLOCK(stcb);
6074         }
6075         if (inp_decr != NULL) {
6076                 /* reduce ref-count */
6077                 SCTP_INP_WLOCK(inp_decr);
6078                 SCTP_INP_DECR_REF(inp_decr);
6079                 SCTP_INP_WUNLOCK(inp_decr);
6080         }
6081         return;
6082 }
6083
6084 #ifdef INET
6085 void
6086 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
6087 {
6088         struct mbuf *m;
6089         int iphlen;
6090         uint32_t vrf_id = 0;
6091         uint8_t ecn_bits;
6092         struct sockaddr_in src, dst;
6093         struct ip *ip;
6094         struct sctphdr *sh;
6095         struct sctp_chunkhdr *ch;
6096         int length, offset;
6097
6098 #if !defined(SCTP_WITH_NO_CSUM)
6099         uint8_t compute_crc;
6100
6101 #endif
6102         uint32_t mflowid;
6103         uint8_t mflowtype;
6104         uint16_t fibnum;
6105
6106         iphlen = off;
6107         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
6108                 SCTP_RELEASE_PKT(i_pak);
6109                 return;
6110         }
6111         m = SCTP_HEADER_TO_CHAIN(i_pak);
6112 #ifdef SCTP_MBUF_LOGGING
6113         /* Log in any input mbufs */
6114         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6115                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
6116         }
6117 #endif
6118 #ifdef SCTP_PACKET_LOGGING
6119         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
6120                 sctp_packet_log(m);
6121         }
6122 #endif
6123         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
6124             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
6125             m->m_pkthdr.len,
6126             if_name(m->m_pkthdr.rcvif),
6127             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
6128         mflowid = m->m_pkthdr.flowid;
6129         mflowtype = M_HASHTYPE_GET(m);
6130         fibnum = M_GETFIB(m);
6131         SCTP_STAT_INCR(sctps_recvpackets);
6132         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
6133         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
6134         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
6135         if (SCTP_BUF_LEN(m) < offset) {
6136                 if ((m = m_pullup(m, offset)) == NULL) {
6137                         SCTP_STAT_INCR(sctps_hdrops);
6138                         return;
6139                 }
6140         }
6141         ip = mtod(m, struct ip *);
6142         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
6143         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
6144         offset -= sizeof(struct sctp_chunkhdr);
6145         memset(&src, 0, sizeof(struct sockaddr_in));
6146         src.sin_family = AF_INET;
6147         src.sin_len = sizeof(struct sockaddr_in);
6148         src.sin_port = sh->src_port;
6149         src.sin_addr = ip->ip_src;
6150         memset(&dst, 0, sizeof(struct sockaddr_in));
6151         dst.sin_family = AF_INET;
6152         dst.sin_len = sizeof(struct sockaddr_in);
6153         dst.sin_port = sh->dest_port;
6154         dst.sin_addr = ip->ip_dst;
6155         length = ntohs(ip->ip_len);
6156         /* Validate mbuf chain length with IP payload length. */
6157         if (SCTP_HEADER_LEN(m) != length) {
6158                 SCTPDBG(SCTP_DEBUG_INPUT1,
6159                     "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
6160                 SCTP_STAT_INCR(sctps_hdrops);
6161                 goto out;
6162         }
6163         /* SCTP does not allow broadcasts or multicasts */
6164         if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
6165                 goto out;
6166         }
6167         if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
6168                 goto out;
6169         }
6170         ecn_bits = ip->ip_tos;
6171 #if defined(SCTP_WITH_NO_CSUM)
6172         SCTP_STAT_INCR(sctps_recvnocrc);
6173 #else
6174         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
6175                 SCTP_STAT_INCR(sctps_recvhwcrc);
6176                 compute_crc = 0;
6177         } else {
6178                 SCTP_STAT_INCR(sctps_recvswcrc);
6179                 compute_crc = 1;
6180         }
6181 #endif
6182         sctp_common_input_processing(&m, iphlen, offset, length,
6183             (struct sockaddr *)&src,
6184             (struct sockaddr *)&dst,
6185             sh, ch,
6186 #if !defined(SCTP_WITH_NO_CSUM)
6187             compute_crc,
6188 #endif
6189             ecn_bits,
6190             mflowtype, mflowid, fibnum,
6191             vrf_id, port);
6192 out:
6193         if (m) {
6194                 sctp_m_freem(m);
6195         }
6196         return;
6197 }
6198
6199 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6200 extern int *sctp_cpuarry;
6201
6202 #endif
6203
6204 int
6205 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED)
6206 {
6207         struct mbuf *m;
6208         int off;
6209
6210         m = *mp;
6211         off = *offp;
6212 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6213         if (mp_ncpus > 1) {
6214                 struct ip *ip;
6215                 struct sctphdr *sh;
6216                 int offset;
6217                 int cpu_to_use;
6218                 uint32_t flowid, tag;
6219
6220                 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) {
6221                         flowid = m->m_pkthdr.flowid;
6222                 } else {
6223                         /*
6224                          * No flow id built by lower layers fix it so we
6225                          * create one.
6226                          */
6227                         offset = off + sizeof(struct sctphdr);
6228                         if (SCTP_BUF_LEN(m) < offset) {
6229                                 if ((m = m_pullup(m, offset)) == NULL) {
6230                                         SCTP_STAT_INCR(sctps_hdrops);
6231                                         return (IPPROTO_DONE);
6232                                 }
6233                         }
6234                         ip = mtod(m, struct ip *);
6235                         sh = (struct sctphdr *)((caddr_t)ip + off);
6236                         tag = htonl(sh->v_tag);
6237                         flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
6238                         m->m_pkthdr.flowid = flowid;
6239                         M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE);
6240                 }
6241                 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
6242                 sctp_queue_to_mcore(m, off, cpu_to_use);
6243                 return (IPPROTO_DONE);
6244         }
6245 #endif
6246         sctp_input_with_port(m, off, 0);
6247         return (IPPROTO_DONE);
6248 }
6249
6250 #endif